release(3.1.0): parity release for the agent family

[rennf93]

Summary

• Version bump 3.0.2 -> 3.1.0 via make bump-version (pyproject.toml, guard_agent/_version.py, docs versions)
• CHANGELOG.md and docs/release-notes.md entry: the parity release for the Guard agent family (Python, TypeScript, Go, PHP, Rust), carrying the 3.0.2 -> 3.1.0 feature list: AES-256-GCM encrypted ingest, sensitive-header redaction, dynamic rules, local rate limiters, helpers. Notes state the earlier 4.1.0 family tags were a version-accuracy error and were yanked/unpublished, and that the conformance corpus (219 cases, spec 4.1.0) validates the surface.

Gates (all local, exit 0)

• uv run pre-commit run --all-files: Passed (ruff-format, ruff, mypy, vulture, bandit, radon, xenon, deptry)
• REDIS_URL=redis://localhost:6379 uv run --extra dev pytest -v --cov=guard_agent: 529 passed, 2 skipped, 100% coverage
• uv build: sdist + wheel built

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📥 Commits

Reviewing files that changed from the base of the PR and between 5972522 and 01f35a7.

📒 Files selected for processing (6)

• .mike.yml
• CHANGELOG.md
• docs/release-notes.md
• docs/versions/versions.json
• guard_agent/_version.py
• pyproject.toml

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