chore: release v8.29.0

[dyoshikawa]

Release v8.29.0

This PR bumps the version to 8.29.0 in preparation for the release.

Highlights

• feat: add Vibe Code (vibe) as a supported tool target (feat: add Vibe Code (vibe) as a supported tool target #1861)
• feat(copilotcli): add agent skills adapter (feat(copilotcli): add agent skills adapter (.github/skills, ~/.copilot/skills) #1872)
• fix(warp): correct Windows permissions path and fold non-root rules into AGENTS.md (fix(warp): correct Windows permissions settings.toml path to LOCALAPPDATA/config #1873, fix(warp): fold non-root rules into root AGENTS.md instead of inert .warp/memories #1870)
• Centralize and prune per-tool path constants (refactor(constants): dedupe and prune centralized path constants #1869)
• Data-loss and processor-parity regression tests (test(generate): add real data-loss regression tests for shared output files #1868, test: extend processor schema-vs-factory parity checks to all processors #1867)

See the draft release notes for the full changelog.

[dyoshikawa]

@dyoshikawa Thank you!