Add transcript import fixtures for agent exports

[kingkyylian]

Roadmap follow-up: add fixture-backed transcript/resume parsers for Claude Code, Codex, Cursor, and Gemini exports so handoffkit resume can prove behavior across real session shapes. Acceptance: representative fixtures, parser tests, and a README usage example.

[kingkyylian]

Local implementation status on 2026-05-23:\n\n- Added representative resume fixtures for Claude Code JSONL, Codex raw transcript text, Cursor Markdown export, and Gemini copied response.\n- Improved parser support for JSON/JSONL transcript text blocks, bare section headings, blockquote/bold role wrappers, XML-like role tags, and Gemini model prefixes.\n- Updated README resume examples, ROADMAP, and CHANGELOG.\n- Assigned this issue to milestone v0.6.0.\n\nVerification run locally:\n- Red test first: new fixture test failed on Claude Code JSONL state extraction.\n- pnpm test tests/unit/resume.test.ts passed.\n- pnpm check passed: typecheck, lint, 12 test files, 40 tests, build.\n- pnpm pack:dry-run passed.\n- Built CLI resume smoke passed for all four new fixtures.\n\nRemaining before closing: commit, push/CI, and decide whether this ships as v0.6.0.

[kingkyylian]

Release-prep update on 2026-05-23:\n\n- Version surface prepared as 0.6.0 in package.json and CLI --version.\n- CHANGELOG entry moved to 0.6.0.\n- Release notes prepared at /private/tmp/handoffkit-v0.6.0-release-notes.md.\n- Pre-release conflict audit was clean: no local/remote v0.6.0 tag, no GitHub release, no npm registry version.\n- Fresh verification passed: pnpm test tests/unit/resume.test.ts, pnpm check, pnpm pack:dry-run, npm publish --dry-run --access public, pnpm smoke:release, node dist/index.js --version, and built CLI resume smoke for all four new fixtures.\n\nRemaining before closing: commit, push/CI, tag v0.6.0, create GitHub release, run Release workflow/publish, registry smoke, then close this issue and milestone.

[kingkyylian]

Shipped in v0.6.0. Commit 1d61555 adds fixture-backed resume import coverage for Claude Code JSONL, Codex raw transcripts, Cursor Markdown exports, and Gemini copied responses. Verified local gates, CI run 26333264435, Release run 26333286547, npm @kingkyylian/handoffkit@0.6.0, and published-package fixture smoke tests.