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

tools/web-search/fixtures/throttled.json

@@ -0,0 +1 @@
+{"query": "Pflegegrad Test 4", "results": [], "answers": [], "corrections": [], "infoboxes": [], "suggestions": [], "unresponsive_engines": [["brave", "Suspended: too many requests"], ["duckduckgo", "CAPTCHA"], ["startpage", "Suspended: CAPTCHA"]]}