Summary:

• Improve README wording for clearer GitHub and search discoverability.
• Add more specific Python package keywords.
• Add project URLs for repository, issues, changelog, security policy, and release.

Scope:

• Documentation and package metadata only.
• No runtime code changes.
• No CI changes.
• No GitHub About/topics metadata changes in this phase.

Validation:

• ./scripts/check.sh passed.
• Isolated wheel/sdist build passed.
• Wheel metadata includes updated summary, keywords, and project URLs.
• Wheel install smoke test passed.
• Secret/claim scan passed with only an expected negated production-ready statement in the threat model.

Risk:

• Low; discoverability metadata and README wording only.

Rollback:

• Revert this PR if the metadata wording causes confusion or should be refined before GitHub About/topics updates.