feat: ship ScratchNode public wiki loop

[HomenShum]

What changed

• Adds a published-only public ScratchNode wiki route at scratchnode.live/e/:slug/wiki.
• Uses the existing events:getPublishedWikiBySlug({ slug }) public reader, extended to return both the flat main-branch shape and the nested route payload without exposing drafts/private notes.
• Wires post-publish room UI to surface/copy the public wiki URL from Share and Wiki sheets.
• Fixes answer Share to copy real addressable answer URLs with #answer-<encodedAnswerId> instead of only showing a toast.
• Leaves an agent coordination handoff with the new query/route contract.

Verification

• npx vitest run convex/__tests__/scratchnode.publicWikiRead.test.ts convex/__tests__/scratchnode.publicWiki.test.ts
• npx playwright test tests/e2e/scratchnode-live-route-honesty.spec.ts --project=chromium --workers=1
• npx tsc --noEmit --pretty false
• npm run build
• Local in-app browser smoke: http://127.0.0.1:5198/proto/home-v5.html loaded with no console errors.

Notes

This supersedes #488, which used the default Codex branch prefix but failed the repo branch-name style gate.

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Project	Deployment	Actions	Updated (UTC)
nodebench-ai	Ready	Preview, Comment	Jun 3, 2026 7:12am

[github-actions]

PR size advisory

This PR adds 598 lines of substantive change. CONTRIBUTING.md defines a soft limit of ~400 LOC.

If the PR is genuinely cohesive (e.g. an architecture map, a generated migration, a deletion of a dead module), no action is needed. Otherwise consider:

• splitting into 2-3 PRs along independent concerns
• pre-discussing the architecture change in a GitHub Discussion before merge

This is advisory — it does not block the merge.

[github-actions]

✅ Dogfood Visual QA Gate: PASSED

Check	Status
Screenshots	23 captured (pass)
Walkthrough	9 chapters (pass)
Key Frames	9 extracted (pass)
Scribe Steps	8 how-to steps (pass)
Build	success

Artifacts

Download the dogfood-evidence-9351a1b artifact from the Actions tab for full screenshots, frames, and walkthrough video.

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Generated by Dogfood QA Gate

[github-actions]

Demo: walkthrough of the surfaces this PR changed is available as a workflow artifact (pr-demo-490) at https://github.com/HomenShum/nodebench-ai/actions/runs/26870000962