standardize packaging, tooling, docs, CI, and licensing

.drone.yml

@@ -32,6 +32,26 @@ steps:
           echo "🆕 New version detected: $PACKAGE_NAME==$VERSION"
         fi
 
+  - name: quality-gate
+    image: python:3.13-slim
+    environment:
+      PIP_REPO_URL:
+        from_secret: PIP_REPO_URL
+      PIP_USERNAME:
+        from_secret: PIP_USERNAME
+      PIP_PASSWORD:
+        from_secret: PIP_PASSWORD
+    commands:
+      - pip install --upgrade pip build
+      - |
+        AUTH_URL="https://${PIP_USERNAME}:${PIP_PASSWORD}@$(echo "${PIP_REPO_URL#*://}" | sed 's:/*$::')/simple"
+        pip install --index-url "$AUTH_URL" --extra-index-url https://pypi.org/simple/ -U ".[dev]"
+      - echo "🛡️ Running quality gate..."
+      - python -m black --check .
+      - python -m ruff check .
+      - python -m mypy
+      - python -m pytest
+
   - name: build-package
     image: python:3.13-slim
     commands:
@@ -126,4 +146,4 @@ steps:
 
 trigger:
   event:
-    - custom
+    - custom

CHANGELOG.md

@@ -0,0 +1,23 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- `py.typed` marker for PEP 561 type information.
+- `.drone.yml` CI with a quality-gate step (black, ruff, mypy, pytest).
+- Canonical `docforge.nav.yml`, generated `mkdocs.yml` and `mcp_docs/` via doc-forge.
+- MIT `LICENSE`.
+
+### Changed
+- Standardized `pyproject.toml` (canonical packaging, lint tool config, extras).
+- `fetch_emails.py` debug script excluded from black/ruff scans.
+
+### Fixed
+- Regression test for immutable config models raises `AssertionError` instead of
+  a bare `assert False`.
+- Stub fixes for typed API surfaces.

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Aetoskia Platform
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

mail_intake/__init__.py

@@ -137,7 +137,6 @@ No individual symbols are re-exported at the package root.
 ---
 """
 
-
 from . import ingestion
 from . import adapters
 from . import auth

mail_intake/__init__.pyi

@@ -1,10 +1,4 @@
-from . import ingestion
-from . import adapters
-from . import auth
-from . import credentials
-from . import models
-from . import config
-from . import exceptions
+from . import adapters, auth, config, credentials, exceptions, ingestion, models
 
 __all__ = [
     "ingestion",

mail_intake/adapters/base.py

@@ -12,7 +12,8 @@ types or semantics should leak beyond implementations of this interface.
 """
 
 from abc import ABC, abstractmethod
-from typing import Iterator, Dict, Any
+from collections.abc import Iterator
+from typing import Any
 
 
 class MailIntakeAdapter(ABC):
@@ -32,7 +33,7 @@ class MailIntakeAdapter(ABC):
     """
 
     @abstractmethod
-    def iter_message_refs(self, query: str) -> Iterator[Dict[str, str]]:
+    def iter_message_refs(self, query: str) -> Iterator[dict[str, str]]:
         """
         Iterate over lightweight message references matching a query.
 
@@ -63,7 +64,7 @@ class MailIntakeAdapter(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def fetch_message(self, message_id: str) -> Dict[str, Any]:
+    def fetch_message(self, message_id: str) -> dict[str, Any]:
         """
         Fetch a full raw message by message identifier.
 
@@ -78,7 +79,7 @@ class MailIntakeAdapter(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def fetch_thread(self, thread_id: str) -> Dict[str, Any]:
+    def fetch_thread(self, thread_id: str) -> dict[str, Any]:
         """
         Fetch a full raw thread by thread identifier.
 

mail_intake/adapters/base.pyi

@@ -1,10 +1,11 @@
 from abc import ABC, abstractmethod
-from typing import Iterator, Dict, Any
+from collections.abc import Iterator
+from typing import Any
 
 class MailIntakeAdapter(ABC):
     @abstractmethod
-    def iter_message_refs(self, query: str) -> Iterator[Dict[str, str]]: ...
+    def iter_message_refs(self, query: str) -> Iterator[dict[str, str]]: ...
     @abstractmethod
-    def fetch_message(self, message_id: str) -> Dict[str, Any]: ...
+    def fetch_message(self, message_id: str) -> dict[str, Any]: ...
     @abstractmethod
-    def fetch_thread(self, thread_id: str) -> Dict[str, Any]: ...
+    def fetch_thread(self, thread_id: str) -> dict[str, Any]: ...

mail_intake/adapters/gmail.py

@@ -15,14 +15,15 @@ It is the only place in the codebase where:
 All Gmail-specific behavior must be strictly contained within this module.
 """
 
-from typing import Iterator, Dict, Any
+from collections.abc import Iterator
+from typing import Any
 
 from googleapiclient.discovery import build
 from googleapiclient.errors import HttpError
 
 from mail_intake.adapters.base import MailIntakeAdapter
-from mail_intake.exceptions import MailIntakeAdapterError
 from mail_intake.auth.base import MailIntakeAuthProvider
+from mail_intake.exceptions import MailIntakeAdapterError
 
 
 class MailIntakeGmailAdapter(MailIntakeAdapter):
@@ -89,7 +90,7 @@ class MailIntakeGmailAdapter(MailIntakeAdapter):
                 ) from exc
         return self._service
 
-    def iter_message_refs(self, query: str) -> Iterator[Dict[str, str]]:
+    def iter_message_refs(self, query: str) -> Iterator[dict[str, str]]:
         """
         Iterate over message references matching the query.
 
@@ -107,9 +108,7 @@ class MailIntakeGmailAdapter(MailIntakeAdapter):
         """
         try:
             request = (
-                self.service.users()
-                .messages()
-                .list(userId=self._user_id, q=query)
+                self.service.users().messages().list(userId=self._user_id, q=query)
             )
 
             while request is not None:
@@ -121,18 +120,14 @@ class MailIntakeGmailAdapter(MailIntakeAdapter):
                         "thread_id": msg["threadId"],
                     }
 
-                request = (
-                    self.service.users()
-                    .messages()
-                    .list_next(request, response)
-                )
+                request = self.service.users().messages().list_next(request, response)
 
         except HttpError as exc:
             raise MailIntakeAdapterError(
                 "Gmail API error while listing messages"
             ) from exc
 
-    def fetch_message(self, message_id: str) -> Dict[str, Any]:
+    def fetch_message(self, message_id: str) -> dict[str, Any]:
         """
         Fetch a full Gmail message by message ID.
 
@@ -160,7 +155,7 @@ class MailIntakeGmailAdapter(MailIntakeAdapter):
                 f"Gmail API error while fetching message {message_id}"
             ) from exc
 
-    def fetch_thread(self, thread_id: str) -> Dict[str, Any]:
+    def fetch_thread(self, thread_id: str) -> dict[str, Any]:
         """
         Fetch a full Gmail thread by thread ID.
 

mail_intake/adapters/gmail.pyi

@@ -1,11 +1,15 @@
-from typing import Iterator, Dict, Any
+from collections.abc import Iterator
+from typing import Any
+
 from mail_intake.adapters.base import MailIntakeAdapter
 from mail_intake.auth.base import MailIntakeAuthProvider
 
 class MailIntakeGmailAdapter(MailIntakeAdapter):
-    def __init__(self, auth_provider: MailIntakeAuthProvider, user_id: str = ...) -> None: ...
+    def __init__(
+        self, auth_provider: MailIntakeAuthProvider[Any], user_id: str = ...
+    ) -> None: ...
     @property
     def service(self) -> Any: ...
-    def iter_message_refs(self, query: str) -> Iterator[Dict[str, str]]: ...
-    def fetch_message(self, message_id: str) -> Dict[str, Any]: ...
-    def fetch_thread(self, thread_id: str) -> Dict[str, Any]: ...
+    def iter_message_refs(self, query: str) -> Iterator[dict[str, str]]: ...
+    def fetch_message(self, message_id: str) -> dict[str, Any]: ...
+    def fetch_thread(self, thread_id: str) -> dict[str, Any]: ...

mail_intake/auth/google.py

@@ -17,12 +17,12 @@ No Google authentication details should leak outside this module.
 """
 
 import os
-from typing import Sequence
+from collections.abc import Sequence
 
 import google.auth.exceptions
 from google.auth.transport.requests import Request
-from google_auth_oauthlib.flow import InstalledAppFlow
 from google.oauth2.credentials import Credentials
+from google_auth_oauthlib.flow import InstalledAppFlow
 
 from mail_intake.auth.base import MailIntakeAuthProvider
 from mail_intake.credentials.store import CredentialStore

mail_intake/auth/google.pyi

@@ -1,7 +1,11 @@
-from typing import Sequence, Any
+from collections.abc import Sequence
+from typing import Any
+
 from mail_intake.auth.base import MailIntakeAuthProvider
 from mail_intake.credentials.store import CredentialStore
 
 class MailIntakeGoogleAuth(MailIntakeAuthProvider[Any]):
-    def __init__(self, credentials_path: str, store: CredentialStore[Any], scopes: Sequence[str]) -> None: ...
+    def __init__(
+        self, credentials_path: str, store: CredentialStore[Any], scopes: Sequence[str]
+    ) -> None: ...
     def get_credentials(self) -> Any: ...

mail_intake/config.py

@@ -12,7 +12,6 @@ environment reads to ensure predictability and testability.
 """
 
 from dataclasses import dataclass
-from typing import Optional
 
 
 @dataclass(frozen=True)
@@ -46,12 +45,12 @@ class MailIntakeConfig:
     Whether ingestion should operate in read-only mode.
     """
 
-    credentials_path: Optional[str] = None
+    credentials_path: str | None = None
     """
     Optional path to provider credentials configuration.
     """
 
-    token_path: Optional[str] = None
+    token_path: str | None = None
     """
     Optional path to persisted authentication tokens.
     """

mail_intake/config.pyi

@@ -1,9 +1,14 @@
-from typing import Optional
-
 class MailIntakeConfig:
     provider: str
     user_id: str
     readonly: bool
-    credentials_path: Optional[str]
-    token_path: Optional[str]
-    def __init__(self, provider: str = ..., user_id: str = ..., readonly: bool = ..., credentials_path: Optional[str] = ..., token_path: Optional[str] = ...) -> None: ...
+    credentials_path: str | None
+    token_path: str | None
+    def __init__(
+        self,
+        provider: str = ...,
+        user_id: str = ...,
+        readonly: bool = ...,
+        credentials_path: str | None = ...,
+        token_path: str | None = ...,
+    ) -> None: ...

mail_intake/credentials/__init__.pyi

@@ -1,5 +1,5 @@
-from .store import CredentialStore
 from .pickle import PickleCredentialStore
 from .redis import RedisCredentialStore
+from .store import CredentialStore
 
 __all__ = ["CredentialStore", "PickleCredentialStore", "RedisCredentialStore"]

mail_intake/credentials/pickle.py

@@ -16,7 +16,7 @@ untrusted environments.
 """
 
 import pickle
-from typing import Optional, TypeVar
+from typing import TypeVar
 
 from mail_intake.credentials.store import CredentialStore
 
@@ -55,7 +55,7 @@ class PickleCredentialStore(CredentialStore[T]):
         """
         self.path = path
 
-    def load(self) -> Optional[T]:
+    def load(self) -> T | None:
         """
         Load credentials from the local filesystem.
 

mail_intake/credentials/pickle.pyi

@@ -1,4 +1,5 @@
-from typing import Optional, TypeVar
+from typing import TypeVar
+
 from .store import CredentialStore
 
 T = TypeVar("T")
@@ -6,6 +7,6 @@ T = TypeVar("T")
 class PickleCredentialStore(CredentialStore[T]):
     path: str
     def __init__(self, path: str) -> None: ...
-    def load(self) -> Optional[T]: ...
+    def load(self) -> T | None: ...
     def save(self, credentials: T) -> None: ...
     def clear(self) -> None: ...

mail_intake/credentials/redis.py

@@ -24,8 +24,8 @@ Credential validation, refresh, rotation, and acquisition remain the
 responsibility of authentication provider implementations.
 """
 
-
-from typing import Optional, TypeVar, Callable
+from collections.abc import Callable
+from typing import TypeVar
 
 from mail_intake.credentials.store import CredentialStore
 
@@ -61,7 +61,7 @@ class RedisCredentialStore(CredentialStore[T]):
         key: str,
         serialize: Callable[[T], bytes],
         deserialize: Callable[[bytes], T],
-        ttl_seconds: Optional[int] = None,
+        ttl_seconds: int | None = None,
     ):
         """
         Initialize a Redis-backed credential store.
@@ -88,7 +88,7 @@ class RedisCredentialStore(CredentialStore[T]):
         self.deserialize = deserialize
         self.ttl_seconds = ttl_seconds
 
-    def load(self) -> Optional[T]:
+    def load(self) -> T | None:
         """
         Load credentials from Redis.
 

mail_intake/credentials/redis.pyi

@@ -1,4 +1,6 @@
-from typing import Optional, TypeVar, Callable, Any
+from collections.abc import Callable
+from typing import Any, TypeVar
+
 from .store import CredentialStore
 
 T = TypeVar("T")
@@ -8,8 +10,15 @@ class RedisCredentialStore(CredentialStore[T]):
     key: str
     serialize: Callable[[T], bytes]
     deserialize: Callable[[bytes], T]
-    ttl_seconds: Optional[int]
-    def __init__(self, redis_client: Any, key: str, serialize: Callable[[T], bytes], deserialize: Callable[[bytes], T], ttl_seconds: Optional[int] = ...) -> None: ...
-    def load(self) -> Optional[T]: ...
+    ttl_seconds: int | None
+    def __init__(
+        self,
+        redis_client: Any,
+        key: str,
+        serialize: Callable[[T], bytes],
+        deserialize: Callable[[bytes], T],
+        ttl_seconds: int | None = ...,
+    ) -> None: ...
+    def load(self) -> T | None: ...
     def save(self, credentials: T) -> None: ...
     def clear(self) -> None: ...

mail_intake/credentials/store.py

@@ -19,9 +19,8 @@ or secrets managers—without coupling authentication logic to any
 specific storage mechanism.
 """
 
-
 from abc import ABC, abstractmethod
-from typing import Generic, Optional, TypeVar
+from typing import Generic, TypeVar
 
 T = TypeVar("T")
 
@@ -48,7 +47,7 @@ class CredentialStore(ABC, Generic[T]):
     """
 
     @abstractmethod
-    def load(self) -> Optional[T]:
+    def load(self) -> T | None:
         """
         Load previously persisted credentials.
 

mail_intake/credentials/store.pyi

@@ -1,11 +1,11 @@
 from abc import ABC, abstractmethod
-from typing import Generic, Optional, TypeVar
+from typing import Generic, TypeVar
 
 T = TypeVar("T")
 
 class CredentialStore(ABC, Generic[T]):
     @abstractmethod
-    def load(self) -> Optional[T]: ...
+    def load(self) -> T | None: ...
     @abstractmethod
     def save(self, credentials: T) -> None: ...
     @abstractmethod

mail_intake/ingestion/reader.py

@@ -16,16 +16,17 @@ It coordinates:
 No provider-specific logic or API semantics are permitted in this layer.
 """
 
+from collections.abc import Iterator
 from datetime import datetime
-from typing import Iterator, Dict, Any
+from typing import Any
 
 from mail_intake.adapters.base import MailIntakeAdapter
+from mail_intake.exceptions import MailIntakeParsingError
 from mail_intake.models.message import MailIntakeMessage
 from mail_intake.models.thread import MailIntakeThread
-from mail_intake.parsers.headers import parse_headers, extract_sender
 from mail_intake.parsers.body import extract_body
+from mail_intake.parsers.headers import extract_sender, parse_headers
 from mail_intake.parsers.subject import normalize_subject
-from mail_intake.exceptions import MailIntakeParsingError
 
 
 class MailIntakeReader:
@@ -101,7 +102,7 @@ class MailIntakeReader:
                 - Messages are grouped by `thread_id` and yielded as complete
                   thread objects containing all associated messages.
         """
-        threads: Dict[str, MailIntakeThread] = {}
+        threads: dict[str, MailIntakeThread] = {}
 
         for ref in self._adapter.iter_message_refs(query):
             raw = self._adapter.fetch_message(ref["message_id"])
@@ -119,7 +120,7 @@ class MailIntakeReader:
 
         return iter(threads.values())
 
-    def _parse_message(self, raw_message: Dict[str, Any]) -> MailIntakeMessage:
+    def _parse_message(self, raw_message: dict[str, Any]) -> MailIntakeMessage:
         """
         Parse a raw provider message into a `MailIntakeMessage`.
 

mail_intake/ingestion/reader.pyi

@@ -1,4 +1,6 @@
-from typing import Iterator, Dict, Any
+from collections.abc import Iterator
+from typing import Any
+
 from mail_intake.adapters.base import MailIntakeAdapter
 from mail_intake.models.message import MailIntakeMessage
 from mail_intake.models.thread import MailIntakeThread
@@ -7,4 +9,4 @@ class MailIntakeReader:
     def __init__(self, adapter: MailIntakeAdapter) -> None: ...
     def iter_messages(self, query: str) -> Iterator[MailIntakeMessage]: ...
     def iter_threads(self, query: str) -> Iterator[MailIntakeThread]: ...
-    def _parse_message(self, raw_message: Dict[str, Any]) -> MailIntakeMessage: ...
+    def _parse_message(self, raw_message: dict[str, Any]) -> MailIntakeMessage: ...

mail_intake/models/message.py

@@ -13,7 +13,6 @@ provider-specific fields or semantics.
 
 from dataclasses import dataclass
 from datetime import datetime
-from typing import Optional, Dict
 
 
 @dataclass(frozen=True)
@@ -54,7 +53,7 @@ class MailIntakeMessage:
     Sender email address.
     """
 
-    from_name: Optional[str]
+    from_name: str | None
     """
     Optional human-readable sender name.
     """
@@ -74,7 +73,7 @@ class MailIntakeMessage:
     Short provider-supplied preview snippet of the message.
     """
 
-    raw_headers: Dict[str, str]
+    raw_headers: dict[str, str]
     """
     Normalized mapping of message headers (header name → value).
     """

mail_intake/models/message.pyi

@@ -1,14 +1,24 @@
 from datetime import datetime
-from typing import Optional, Dict
 
 class MailIntakeMessage:
     message_id: str
     thread_id: str
     timestamp: datetime
     from_email: str
-    from_name: Optional[str]
+    from_name: str | None
     subject: str
     body_text: str
     snippet: str
-    raw_headers: Dict[str, str]
-    def __init__(self, message_id: str, thread_id: str, timestamp: datetime, from_email: str, from_name: Optional[str], subject: str, body_text: str, snippet: str, raw_headers: Dict[str, str]) -> None: ...
+    raw_headers: dict[str, str]
+    def __init__(
+        self,
+        message_id: str,
+        thread_id: str,
+        timestamp: datetime,
+        from_email: str,
+        from_name: str | None,
+        subject: str,
+        body_text: str,
+        snippet: str,
+        raw_headers: dict[str, str],
+    ) -> None: ...

mail_intake/models/thread.py

@@ -12,7 +12,6 @@ for higher-level correspondence workflows.
 
 from dataclasses import dataclass, field
 from datetime import datetime
-from typing import List, Set
 
 from mail_intake.models.message import MailIntakeMessage
 
@@ -42,12 +41,12 @@ class MailIntakeThread:
     Normalized subject line used to group related messages.
     """
 
-    participants: Set[str] = field(default_factory=set)
+    participants: set[str] = field(default_factory=set)
     """
     Set of unique participant email addresses observed in the thread.
     """
 
-    messages: List[MailIntakeMessage] = field(default_factory=list)
+    messages: list[MailIntakeMessage] = field(default_factory=list)
     """
     Ordered list of messages belonging to this thread.
     """

mail_intake/models/thread.pyi

@@ -1,12 +1,19 @@
 from datetime import datetime
-from typing import List, Set, Optional
+
 from .message import MailIntakeMessage
 
 class MailIntakeThread:
     thread_id: str
     normalized_subject: str
-    participants: Set[str]
-    messages: List[MailIntakeMessage]
-    last_activity_at: Optional[datetime]
-    def __init__(self, thread_id: str, normalized_subject: str, participants: Set[str] = ..., messages: List[MailIntakeMessage] = ..., last_activity_at: Optional[datetime] = ...) -> None: ...
+    participants: set[str]
+    messages: list[MailIntakeMessage]
+    last_activity_at: datetime | None
+    def __init__(
+        self,
+        thread_id: str,
+        normalized_subject: str,
+        participants: set[str] = ...,
+        messages: list[MailIntakeMessage] = ...,
+        last_activity_at: datetime | None = ...,
+    ) -> None: ...
     def add_message(self, message: MailIntakeMessage) -> None: ...

mail_intake/parsers/__init__.pyi

@@ -1,5 +1,5 @@
 from .body import extract_body
-from .headers import parse_headers, extract_sender
+from .headers import extract_sender, parse_headers
 from .subject import normalize_subject
 
 __all__ = ["extract_body", "parse_headers", "extract_sender", "normalize_subject"]

mail_intake/parsers/body.py

@@ -11,7 +11,7 @@ prefers human-readable text over fidelity to original formatting.
 """
 
 import base64
-from typing import Dict, Any, Optional
+from typing import Any
 
 from bs4 import BeautifulSoup
 
@@ -45,7 +45,7 @@ def _decode_base64(data: str) -> str:
         raise MailIntakeParsingError("Failed to decode message body") from exc
 
 
-def _extract_from_part(part: Dict[str, Any]) -> Optional[str]:
+def _extract_from_part(part: dict[str, Any]) -> str | None:
     """
     Extract text content from a single MIME part.
 
@@ -82,7 +82,7 @@ def _extract_from_part(part: Dict[str, Any]) -> Optional[str]:
     return None
 
 
-def extract_body(payload: Dict[str, Any]) -> str:
+def extract_body(payload: dict[str, Any]) -> str:
     """
     Extract the best-effort message body from a Gmail payload.
 

mail_intake/parsers/body.pyi

@@ -1,3 +1,3 @@
-from typing import Dict, Any
+from typing import Any
 
-def extract_body(payload: Dict[str, Any]) -> str: ...
+def extract_body(payload: dict[str, Any]) -> str: ...

mail_intake/parsers/headers.py

@@ -10,10 +10,8 @@ The functions here are intentionally simple and tolerant of malformed
 or incomplete header data.
 """
 
-from typing import Dict, List, Tuple, Optional
 
-
-def parse_headers(raw_headers: List[Dict[str, str]]) -> Dict[str, str]:
+def parse_headers(raw_headers: list[dict[str, str]]) -> dict[str, str]:
     """
     Convert a list of Gmail-style headers into a normalized dict.
 
@@ -50,7 +48,7 @@ def parse_headers(raw_headers: List[Dict[str, str]]) -> Dict[str, str]:
             }
         ```
     """
-    headers: Dict[str, str] = {}
+    headers: dict[str, str] = {}
 
     for header in raw_headers or []:
         name = header.get("name")
@@ -64,7 +62,7 @@ def parse_headers(raw_headers: List[Dict[str, str]]) -> Dict[str, str]:
     return headers
 
 
-def extract_sender(headers: Dict[str, str]) -> Tuple[str, Optional[str]]:
+def extract_sender(headers: dict[str, str]) -> tuple[str, str | None]:
     """
     Extract sender email and optional display name from headers.
 

mail_intake/parsers/headers.pyi

@@ -1,4 +1,2 @@
-from typing import Dict, List, Tuple, Optional
-
-def parse_headers(raw_headers: List[Dict[str, str]]) -> Dict[str, str]: ...
-def extract_sender(headers: Dict[str, str]) -> Tuple[str, Optional[str]]: ...
+def parse_headers(raw_headers: list[dict[str, str]]) -> dict[str, str]: ...
+def extract_sender(headers: dict[str, str]) -> tuple[str, str | None]: ...

mail_intake/parsers/subject.py

@@ -12,7 +12,6 @@ meaning while removing common reply and forward prefixes.
 
 import re
 
-
 _PREFIX_RE = re.compile(r"^(re|fw|fwd)\s*:\s*", re.IGNORECASE)
 """
 Regular expression matching common reply/forward subject prefixes.

pyproject.toml

@@ -37,17 +37,18 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Communications :: Email",
     "Topic :: Software Development :: Libraries",
+    "Typing :: Typed",
 ]
 
+
 dependencies = [
-    # Gmail API stack
     "google-api-python-client>=2.120.0",
     "google-auth>=2.28.0",
     "google-auth-oauthlib>=1.2.0",
 
-    # Parsing
     "beautifulsoup4>=4.12.0",
     "lxml>=5.1.0",
 ]
@@ -56,15 +57,26 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest>=8.0.0",
+    "pytest-asyncio>=0.21.0",
     "pytest-cov>=4.1.0",
+    "black>=23.0.0",
     "ruff>=0.3.0",
     "mypy>=1.8.0",
+    "build>=1.0.0",
+    "twine>=4.0.0",
+    "pre-commit>=3.4.0",
     "types-beautifulsoup4",
+    "doc-forge[mcp,mkdocs]>=0.0.6",
 ]
 
 docs = [
     "mkdocs>=1.5.0",
     "mkdocs-material>=9.5.0",
+    "mkdocstrings[python]>=0.24.0",
+]
+
+all = [
+    "mail-intake[dev,docs]",
 ]
 
 
@@ -79,12 +91,102 @@ Versions = "https://git.aetoskia.com/aetos/mail-intake/tags"
 [tool.setuptools]
 packages = { find = { include = ["mail_intake*"] } }
 
+[tool.setuptools.package-data]
+mail_intake = ["py.typed"]
+
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+asyncio_mode = "auto"
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "--strict-markers",
+    "--strict-config",
+    "--cov=mail_intake",
+    "--cov-report=term-missing",
+    "--cov-report=html",
+    "--cov-report=xml",
+]
+
+
+[tool.black]
+line-length = 88
+target-version = ["py310", "py311", "py312", "py313"]
+include = '\.pyi?$'
+extend-exclude = '''
+fetch_emails\.py$ | /(
+  \.eggs
+  | \.git
+  | \.hg
+  | \.mypy_cache
+  | \.tox
+  | \.venv
+  | build
+  | dist
+)/
+'''
+
 
 [tool.ruff]
-line-length = 100
+line-length = 88
 target-version = "py310"
+exclude = ["fetch_emails.py"]
+
+[tool.ruff.lint]
+select = [
+    "E",
+    "W",
+    "F",
+    "I",
+    "B",
+    "C4",
+    "UP",
+]
+ignore = [
+    "E501",
+    "B008",
+    "C901",
+]
+
+[tool.ruff.lint.per-file-ignores]
+"__init__.py" = ["F401", "I001"]
+"tests/*" = ["B008"]
+
 
 [tool.mypy]
 python_version = "3.10"
 strict = true
+exclude = [
+    "tests/",
+]
+files = ["mail_intake"]
+
+[[tool.mypy.overrides]]
+module = [
+    "google.*",
+    "googleapiclient.*",
+    "bs4.*",
+    "lxml.*",
+]
 ignore_missing_imports = true
+
+
+[tool.coverage.run]
+source = ["mail_intake"]
+omit = [
+    "*/tests/*",
+    "*/test_*.py",
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "if __name__ == .__main__.:",
+    "raise AssertionError",
+    "raise NotImplementedError",
+    "if TYPE_CHECKING:",
+    "@abstractmethod",
+]

tests/unit/test_models.py

@@ -1,7 +1,6 @@
 from datetime import datetime, timedelta
 
-from mail_intake.models import MailIntakeMessage
-from mail_intake.models import MailIntakeThread
+from mail_intake.models import MailIntakeMessage, MailIntakeThread
 
 
 def test_message_is_immutable():
@@ -19,7 +18,7 @@ def test_message_is_immutable():
 
     try:
         msg.subject = "Changed"
-        assert False, "Message should be immutable"
+        raise AssertionError("Message should be immutable")
     except Exception:
         assert True
 

tests/unit/test_parsers.py

@@ -1,8 +1,11 @@
 import base64
 
-from mail_intake.parsers import normalize_subject
-from mail_intake.parsers import parse_headers, extract_sender
-from mail_intake.parsers import extract_body
+from mail_intake.parsers import (
+    extract_body,
+    extract_sender,
+    normalize_subject,
+    parse_headers,
+)
 
 
 def _b64(text: str) -> str:
@@ -13,6 +16,7 @@ def _b64(text: str) -> str:
 # Subject parsing
 # --------------------
 
+
 def test_normalize_subject_strips_common_prefixes():
     assert normalize_subject("Re: Interview Update") == "Interview Update"
     assert normalize_subject("Fwd: Re: Offer Letter") == "Offer Letter"
@@ -32,6 +36,7 @@ def test_normalize_subject_empty_and_none_safe():
 # Header parsing
 # --------------------
 
+
 def test_parse_headers_lowercases_keys():
     raw_headers = [
         {"name": "From", "value": "Alice <alice@example.com>"},
@@ -82,6 +87,7 @@ def test_extract_sender_missing_from():
 # Body parsing
 # --------------------
 
+
 def test_extract_body_prefers_text_plain():
     payload = {
         "parts": [
@@ -116,9 +122,7 @@ def test_extract_body_falls_back_to_html():
 
 
 def test_extract_body_single_part():
-    payload = {
-        "body": {"data": _b64("Single part body")}
-    }
+    payload = {"body": {"data": _b64("Single part body")}}
 
     body = extract_body(payload)
     assert body == "Single part body"