build(ci): uv toolchain, release-please semver; feat(skills): vendor tools self-contained (no symlinks, relative refs)

- bin/db/psql-yq + bin/web/search + tools/{yamlout,websearch} vendored as real files
- bin/db/ssh-tunnel added (OnlyOffice VM pg on 5433)
- skills reference local bin/ paths; no agent-skills/abs links in git
- pyproject.toml + uv.lock; CI installs via uv sync --frozen
- release-please auto-tags semver from conventional commits when green
- LICENSE MIT, badges/mermaid README

AGENTS.md

@@ -34,8 +34,9 @@ Read first: [PLAN](PLAN.md) → [docs](docs/).
 ```
 PLAN.md       decisions + execution + open questions
 docs/         published docs
-skills/       in-project agent skills (this is the integration target)
+skills/       in-project agent skills (vendored, no external links)
 bin/          self-describing tools bin/{subject}/{method}
+tools/        vendored python libs behind bin/* (yamlout, websearch)
 var/          kb.lbug, caches (gitignored)
 .venv/        ladybug + model2vec + mistune
 ```