TUI improvements (v0.2.9)

[KaluJo]

v0.2.9 — TUI polish + test-coverage gap-fillers + a dedicated CI workflow.

Highlights

• Header bar tests — render-to-text golden coverage for the brand/version/user/clock layout, plus a regression pin for the vv0.2.x doubling bug when CI passes a v-prefixed git tag through.
• Golden CLI tests — exit-code matrix gap-fillers: pcr push without auth (code 10), pcr bundle --nonexistent-flag (clap usage 2), and pcr bundle --delete without a name (also 2).
• cursor_ingestion smoke test — covers the cursor source end-to-end through ingestion → store.
• db_migration smoke test — builds a v1-schema fixture DB, runs migrate_v1, and re-queries the resulting v2 DB to pin schema drift; depends on rusqlite as a dev-dep.
• Fixture round-trip tests — claude_fixture_roundtrip + vscode_fixture_roundtrip using checked-in minimal .jsonl fixtures so parser regressions stop sneaking through.
• CI workflow — new .github/workflows/ci.yml runs fmt --check, clippy -D warnings, cargo test, and a best-effort cargo doc on every PR to main and on every non-main push branch.
• RELEASING.md — adds the protected-main note up front so future releases go through a PR instead of a direct push.
• Addictive-grade UX polish (from 35c0a81):
  • pcr <cmd> --help renders the rich help.rs single-source-of-truth (purpose / when-to-use / examples / see-also / docs) so the line CLI matches pcr help's TUI.
  • pcr push close-out: ▲ pushed N prompts in K bundles · 2.1s with retry hint on failure.
  • pcr log drafts section: per-source color-coding, aligned HH:MM timestamps.
  • show TUI: vim-style y (yank id) and o (open URL); 1-row context strip with project · branch · drafts · last-pushed.
  • Unified close-out shape across init / bundle / pull / push (▲ + success tone + one-line next hint).

Version bumps

• Workspace → 0.2.9
• pcr-dev napi meta → 0.2.9 (+ all 4 optionalDependencies pinned)
• All 4 napi subpackage manifests → 0.2.9
• README dashboard mock header → v0.2.9

Verification

• cargo fmt --all -- --check — clean
• cargo clippy --workspace --all-targets -- -D warnings — clean
• cargo test --workspace — 105 unit + integration tests pass

Tagging v0.2.9 after squash-merge fans out into lint → binaries → napi → npm-publish → release → homebrew per RELEASING.md.