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

skills/diataxis-docs/SKILL.md

@@ -34,8 +34,8 @@ related:
 becomes a graph edge:
 
 ```bash
-bin/kb/search search "deploy" --type howto
-bin/kb/search search "Stecktafel" --hop 1     # follow links and related
+bin/kb/search "deploy" --type howto
+bin/kb/search "Stecktafel" --hop 1     # follow links and related
 ```
 
 ## Audit checklist