feat: deepen repo profiler context

[fazxes]

Summary

• expand Loop 2 repo profiling with dependency and convention analysis
• scan nested package.json files and Python manifests, and pass the richer RepoProfile into planner/work-order prompts
• update tests, tracker, changelog, learning log, handoff, and follow-up tasks

Test plan

• make check
• bash scripts/validate-docs.sh
• python3 - <<'PY'
  import json
  import tempfile
  from pathlib import Path
  from nightshift.profiler import profile_repo
  with tempfile.TemporaryDirectory() as tmp:
  repo = Path(tmp)
  (repo / 'src').mkdir()
  (repo / 'src' / 'user_service.py').write_text('from app.core import run\n', encoding='utf-8')
  (repo / 'src' / 'billing_service.py').write_text('import pathlib\n', encoding='utf-8')
  (repo / 'requirements.txt').write_text('fastapi>=0.110\npytest==8.2.0\n', encoding='utf-8')
  web = repo / 'apps' / 'web'
  web.mkdir(parents=True)
  (web / 'package.json').write_text(json.dumps({'dependencies': {'react': '^18.2.0'}}), encoding='utf-8')
  profile = profile_repo(repo)
  print(profile['dependencies'])
  print(profile['conventions'])
  print([fw['name'] for fw in profile['frameworks']])
  PY