feat: expand reminder catalogue

[leoncheng57]

Summary

• expand the catalogue from 7 to 17 presets with 10 concise adaptations from leoncheng57/agent-skills
• retain the existing duck-mode and parallel-research-handoff bodies while adding provenance, and keep the 5 local presets independent
• parse bounded human titles and stripped source metadata, then show titles in the existing width-constrained selector
• document the upstream audit/update procedure and add catalogue safety plus two-reminder ID-only round-trip coverage

Provenance

• source repository: https://github.com/leoncheng57/agent-skills
• source commit: 8b036a41f578dc6c6307ae0a8dd2857121afcabb
• imported/adapted presets: 12 total (10 new, 2 existing)
• local presets: 5
• shipped catalogue: 17 unique presets

Frontmatter stores source_repo, source_path, and source_commit; the loader strips all frontmatter before reminder injection. Runtime and tests do not fetch GitHub.

Safety

• browser prompt requests still send one reminder ID only; bodies are resolved by the BFF
• shipped presets have no triggers, user interpolation, secrets, destructive defaults, default-branch pushes, or automatic merge/push behavior
• worktree/session reminders preserve branch, permission, shared-resource, and no-force-push safeguards

Verification

• npm run typecheck
• npm test (174 passed)
• npm run build
• CI=1 PORT=3510 MOCK_OPENCODE_PORT=4699 MOCK_PREVIEW_PORT=4700 lockf -k /tmp/custom-dca-opencode-e2e.lock npm run test:e2e -- --workers=1 (121 passed)
• git diff --cached --check