[codex] prepare 0.9.2 release

[f1sherFM]

What changed

Prepares the 0.9.2 bugfix release.

• Bumps package metadata from 0.9.1 to 0.9.2.
• Bumps pydoc2markdown.__version__ to 0.9.2.
• Adds a focused 0.9.2 changelog entry for the public-readiness edge-case fixes merged in [codex] fix generation edge cases #62.

Why

0.9.2 should be the version users install before public launch. It includes fixes for package-relative docstring inheritance, watch-mode prune manifests, watch-mode README links, and duplicate cross-reference names across modules.

Validation

• pydoc2markdown --version reports 0.9.2
• pytest tests -> 226 passed
• ruff check src tests
• ruff format --check src tests
• mypy src
• docs --check for examples/sample_project
• docs --check for examples/docs
• git diff --check
• pre-commit hooks on commit