chore(release): 0.0.3

Squash-merge lib-standardisation: adopt repo standards across packaging,
tooling, docs, and CI.

- standardize pyproject.toml (canonical packaging, lint config, extras, GSDFC pydoclint)
- add py.typed marker, modernize type hints and Google-style docstrings
- nest generated docs under docs/lib and docs/mcp; add hand-written wiki
- adopt standard Type A PyPI CI pipeline (tag==version guard + quality gate)
- promote generated CHANGELOG.md; bump version to 0.0.3

docs/lib/adapters/base.md

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+# Base
+
+::: mail_intake.adapters.base

docs/lib/adapters/gmail.md

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+# Gmail
+
+::: mail_intake.adapters.gmail

docs/lib/adapters/index.md

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+# Adapters
+
+::: mail_intake.adapters

docs/lib/auth/base.md

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+# Base
+
+::: mail_intake.auth.base

docs/lib/auth/google.md

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+# Google
+
+::: mail_intake.auth.google

docs/lib/auth/index.md

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+# Auth
+
+::: mail_intake.auth

docs/lib/config.md

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+# Config
+
+::: mail_intake.config

docs/lib/credentials/index.md

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+# Credentials
+
+::: mail_intake.credentials

docs/lib/credentials/pickle.md

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+# Pickle
+
+::: mail_intake.credentials.pickle

docs/lib/credentials/redis.md

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+# Redis
+
+::: mail_intake.credentials.redis

docs/lib/credentials/store.md

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+# Store
+
+::: mail_intake.credentials.store

docs/lib/exceptions.md

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+# Exceptions
+
+::: mail_intake.exceptions

docs/lib/index.md

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+# mail_intake
+
+::: mail_intake

docs/lib/ingestion/index.md

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+# Ingestion
+
+::: mail_intake.ingestion

docs/lib/ingestion/reader.md

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+# Reader
+
+::: mail_intake.ingestion.reader

docs/lib/models/index.md

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+# Models
+
+::: mail_intake.models

docs/lib/models/message.md

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+# Message
+
+::: mail_intake.models.message

docs/lib/models/thread.md

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+# Thread
+
+::: mail_intake.models.thread

docs/lib/parsers/body.md

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+# Body
+
+::: mail_intake.parsers.body

docs/lib/parsers/headers.md

@@ -0,0 +1,3 @@
+# Headers
+
+::: mail_intake.parsers.headers

docs/lib/parsers/index.md

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+# Parsers
+
+::: mail_intake.parsers

docs/lib/parsers/subject.md

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+# Subject
+
+::: mail_intake.parsers.subject