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/agent-cost/SKILL.md

@@ -9,10 +9,10 @@ description: >-
 # agent-cost
 
 ```bash
-bin/agents/cost                       # every project, YAML
-bin/agents/cost --repo brain-ui   # only sessions whose cwd matches
+bin/agents/cost                        # every project, YAML
+bin/agents/cost --repo 2dph            # only sessions whose cwd matches
 bin/agents/cost --json | jq .cursor.by_tool
-bin/agents/cost --snapshot after-x --repo brain-ui   # append a row to docs/CONTEXT-BUDGET.md
+bin/agents/cost --snapshot after-x --repo 2dph   # append a row to docs/CONTEXT-BUDGET.md
 ```
 
 Reads local session storage from OpenCode and Cursor transcripts. Reports the