…ia state file

- Extract AgentCapabilities interface and registry to
  agents/shared/capabilities.ts
- Replace hardcoded agentType checks in base.ts with
  capability lookups
- Remove needsGitHubToken from AgentCapabilities
  (top-level AgentProfile field is single source of truth)
- Update adapter test to match simplified capabilities

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Pass repoDir to createProgressMonitor in adapter.ts and base.ts so the
  state file is actually written (previously dead code)
- Update lifecycle.ts callback signature to forward repoDir
- Add optional repoDir param to readProgressCommentId() for API symmetry
  with writeProgressCommentId() and clearProgressCommentId()
- Add .cascade-progress-comment-id to .gitignore
- Merge split fs imports in progressState.ts
- Replace require('node:fs') with ESM imports in progressState tests
- Add clarifying comment on maybeWriteStateFile call path

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…ntCapabilities

Replace inline capability objects in agent-profiles.ts with getAgentCapabilities()
lookups, eliminating the dual-registry sync risk flagged in code review.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…e-dedup

refactor(agents): extract shared lifecycle utilities to eliminate code duplication

…fails

The `else` branch in `postProgressToPM` (entered when `postInitialComment()`
fails and the first tick creates the comment) was not calling
`maybeWriteStateFile()`, leaving the state file unwritten. This meant
the PostComment gadget would not find the progress comment ID and would
create a duplicate instead of replacing it.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

clearProgressCommentId() uses rmSync which can throw on permissions
errors. Since stop() is called from finally blocks in lifecycle.ts
and adapter.ts, an uncaught exception would mask the actual agent
execution result. Wrap in try-catch for best-effort cleanup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…t-replace

feat(progress): replace initial progress comment with final summary via state file