feat: Claude Runtime Status Module + Preset Status Parity

[minislively]

Summary

Extract true status-string builders into claude-runtime-status.ts and add readClaudeHookPresetStatus() to achieve structural parity with the Codex adapter.

Changes

• Create src/adapters/claude-runtime-status.ts

  • CLAUDE_ADDITIONAL_CONTEXT_MAX_CHARS constant (moved from hook file)
  • clampAdditionalContext() — 9000-char cap utility
  • sessionStartContext() — SessionStart context string
  • boundedFallbackContext() — fallback guidance string

• Refactor src/adapters/claude-runtime-hook.ts

  • Imports status utilities from ./claude-runtime-status
  • Re-exports CLAUDE_ADDITIONAL_CONTEXT_MAX_CHARS for backward-compatible test imports
  • Keeps buildPayloadContext() in place (payload assembly stays in hook file)

• Add readClaudeHookPresetStatus() to src/adapters/claude-hook-preset.ts

  • Returns ClaudeHookPresetStatus with installedEvents, missingEvents, unexpectedFooksEvents, disabledByLocalSettings
  • Wraps file reading in try/catch; returns valid: false + blocker on parse failure
  • Migrates hookCommandsForEvent helper into preset module

• Refactor src/adapters/claude-status.ts

  • hookStatus() delegates core preset validation to readClaudeHookPresetStatus()
  • Keeps manifest/adapter JSON checks as enrichment layer
  • Removes ~60 lines of duplicated preset-reading logic, types, and helpers

Principles

1. Honest module boundaries — *-runtime-status.ts mirrors Codex: simple string builders only
2. Zero behavior change — pure refactoring, no functional differences
3. Preserve public APIs — ClaudeRuntimeHookDecision and exports remain stable
4. Deduplicate, don't duplicate — readClaudeHookPresetStatus() becomes source of truth

Verification

• npm run build passes with zero TypeScript errors
• npm test passes (209 tests, 0 failures)
• Architect reviewer verified module boundaries and backward compatibility

Test plan

• Build passes
• All tests pass
• Spot-check: SessionStart, escape-hatch, first-seen, repeated-file, fallback context strings are byte-identical before/after refactor