feat: skill marketplace UI

[proofmancer]

Closes #7.

Summary

• New src/lib/skills.ts scans ~/.claude/skills/ (user) and <workspace.cwd>/.claude/skills/ (project), one level deep. Each SKILL.md's frontmatter is parsed by a tiny inline regex parser (no new dep). Malformed or missing frontmatter falls back to the directory name + empty description so a single bad skill doesn't break the page.
• New GET /api/workspaces/[id]/skills returns the union, with the same workspace cwd validation as the memory endpoint.
• SkillsGrid client component renders the list as a responsive card grid (mono name, truncated description, user / project badge) with a rescan button.
• CreateAgentForm rewritten: the comma-separated text input is gone, replaced with a checkbox list populated from the scanned skills. Previously-pinned skills that no longer exist on disk render below the list tagged missing so the user knows why they aren't loading.
• Wired into the workspace page as a new "Skills" section above Agents. No schema change, agents.skills already stores names.

Build fix bundled

Same SQLITE_BUSY in next build's parallel page-data workers as #13 / #14. This branch needed a stronger fix: journal_mode = WAL requires an exclusive lock that does not honor busy_timeout, so the build phase now opens an in-memory DB (per-process, race-free) and the runtime opens the file as before. Gated on NEXT_PHASE === 'phase-production-build'.

Test plan

• Open a workspace, see skills from both ~/.claude/skills/ and the workspace's .claude/skills/, badged user / project.
• Create an agent, pick skills via checkboxes, run it. Confirm the chosen skill names are written into the workspace's .claude/settings.local.json under argus.pinnedSkills.
• Workspace with no ~/.claude/skills/ still renders project-level skills without erroring.
• Pin a skill, delete its SKILL.md, open the agent form again. The skill appears below the list tagged missing but stays selectable.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 329ff2ee-3bed-4b57-9ace-2319c82e8e53

📥 Commits

Reviewing files that changed from the base of the PR and between fd682c9 and 21c3bde.

📒 Files selected for processing (6)

• src/app/api/workspaces/[id]/skills/route.ts
• src/app/workspace/[id]/page.tsx
• src/components/CreateAgentForm.tsx
• src/components/SkillsGrid.tsx
• src/lib/db.ts
• src/lib/skills.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/skill-marketplace

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