Prepare v0.1.1 release publication

[jmcte]

Objective

Prepare the already-validated v0.1.1 patch for publication by removing stale statements that it is blocked on issue #98.

Context

Issue #98 and every listed child issue are closed. main has passed extended validation, and the full release dry-run has built and smoke-tested the wheel and source distribution. The current changelog and versioning guide still say v0.1.1 is blocked, which would produce inaccurate GitHub release notes.

Acceptance criteria

• CHANGELOG.md identifies v0.1.1 as ready to be tagged and removes the obsolete Phase A blocker statement.
• docs/versioning.md states the current release-preparation state accurately.
• The version (0.1.1), proposed tag (v0.1.1), and changelog heading remain aligned.
• Documentation and release validation checks pass.

Follow-up

After this issue's PR merges, a maintainer may create the immutable v0.1.1 tag from that merge commit to trigger the GitHub Release workflow.

[jmcte]

Claiming the release-preparation slice. I will update CHANGELOG.md and docs/versioning.md only, then run the documentation and release validation paths before opening the PR.