release: 0.1.1 — fix a PyPI page that says the package is unpublished

[FZ2000]

Problem

https://pypi.org/project/da-sync/ currently tells visitors:

Option B — pip install. Not published yet. Use Option A for now.

That is the pre-launch README, on the page of the published package. A
project description is frozen into the uploaded artifact and PyPI provides no
way to edit one, so the README corrections from #7 and #10 remain invisible to
anyone arriving via PyPI until a new version is uploaded.

Solution

A documentation-only release. No code changes beyond the version constant.

• dacli/constants.py → 0.1.1 (pyproject reads it via attr, so the wheel
  follows automatically)
• CITATION.cff version + date-released
• CHANGELOG.md section retitled, with the reason for the release recorded

Verification

Run with a clean Homebrew 3.14 interpreter, asserting it imported the repo's
dacli and not the da-sync copy installed for testing.

check_version_sync earned its place here — it caught three stale spots that
a by-hand bump would have shipped:

• docs/reference/cli.md still embedded version 0.1.0 (regenerated)
• docs/getting-started.md:76 and :108 quoted da-cli 0.1.0, one of them
  the da --version transcript added only yesterday in docs: document the PyPI install path in the guides, not just the README #10

After fixing those:

• check_version_sync --tag v0.1.1 → passes
• check_version_sync --tag v0.1.0 → refused, "tag 'v0.1.0' does not match
  dacli.version", exit 1. That is the guard release.yml runs before it
  builds anything, so it was worth watching it fire.
• check_doc_flags, check_doc_references, check_discoverability → pass
• No test hardcodes a version; test_shim.py and test_cli.py both assert
  against dacli.__version__, so the bump cannot silently break them.

After merge

Tagging v0.1.1 triggers release.yml, which re-checks the tag against the
package version, builds, publishes to PyPI via Trusted Publishing (OIDC) with
PEP 740 attestations, and creates the GitHub release.

🤖 Generated with Claude Code