Tasks: make the notification/escalation mechanism coherent

Phase 3 of 3 (requirements → design → tasks).

Provenance note (paper trail): authored retroactively during PR #83 review (see requirements.md). All tasks below shipped in PR #83's single commit; checkmarks reflect the delivered state, and each task's proof is listed as executed.

Task list

• [x] 1. Author collaborators.schema.json + rewrite templates/collaborators.yaml
  • $defs/collaborator + $defs/notificationChannel (per-user/per-channel enabled, type: slack, via: mcp|cli|api, slack channel-list)
  • Depends on: none — Requirements: R1
  • Test: scripts/validate_config.py validates .the-loop/collaborators.yaml + template against the new schema (run: VALID)
• [x] 2. Rename plugin config → harness-config.{yaml,schema.json} (repo + template), drop personas/messaging, add notifications.events (harness taxonomy → roles), update x-onboarding
  • Depends on: 1 — Requirements: R2, R4
  • Test: scripts/validate_config.py (run: VALID both files)
• [x] 3. Migrate this repo's own personas entry into a real .the-loop/collaborators.yaml (dogfooding; notifications enabled: false until a channel-list is filled)
  • Depends on: 1, 2 — Requirements: R1
  • Test: scripts/validate_config.py (run: VALID)
• [x] 4. cli-config: add collaborators via cross-file $ref + daemon-side notifications.events; extend repo copy + template
  • Depends on: 1 — Requirements: R3
  • Test: ref-store probe — valid collaborator accepted, entry missing roles rejected through the $ref (run: passed); scripts/validate_config.py (VALID)
• [x] 5. scripts/validate_config.py: third schema target + local ref store; hooks/hooks.json + CI json-sanity list updated
  • Depends on: 1, 2, 4 — Requirements: R1.5, NFR
  • Test: make validate (run: 6× VALID)
• [x] 6. scenarios.py: read harness-config.yaml with pre-rename fallback
  • Depends on: 2 — Requirements: R4.3
  • Test: cli/tests/test_cli.py::test_load_config_globs_prefers_harness_config_with_config_yaml_fallback (red→green; run: passed)
• [x] 7. Rename sweep through living files only (commands, skills, README, CLAUDE.md, docs site, capability docs, manifest); historical records untouched
  • Depends on: 2 — Requirements: R4.1
  • Test: grep audit — zero stray personas/messaging/config.yaml refs in living files (run: clean); markdownlint (run: 0 errors)
• [x] 8. Migration path: manifest.deprecated entries + upgrade-the-loop.md migration section; collaborators.yaml → managed: true
  • Depends on: 2, 3 — Requirements: R4.2
  • Test: manifest YAML parses; upgrade doc names every moved key (reviewed)
• [x] 9. Paper trail + docs: decision-035 (+ index), collaboration.md rewrite, docs/reference/configuration.md, cli/README.md config tables, docs/capabilities/cli.md history
  • Depends on: 1–8 — Requirements: R1–R4
  • Test: markdownlint (run: 0 errors)
• [x] 10. Full gate: make check
  • Depends on: all — Requirements: NFR
  • Test: ruff + markdownlint + ruff-format + pyright + validate + pytest (run: 257 passed)