standardize packaging, tooling, docs, CI, and licensing

CHANGELOG.md

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+# 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).
+- MIT `LICENSE`.
+
+### Changed
+- Standardized `pyproject.toml` (canonical packaging, lint tool config, extras).
+- Pinned the `mcp` extra to `mcp>=1.0.0,<2.0.0` to restore compatibility with
+  the current MCP server API used by doc-forge.
+
+### Fixed
+- Stub fixes for typed API surfaces.