feat: Plan Canvas, a browser review canvas for plans (#2467)

* feat: add Plan Canvas - browser annotate-and-approve review for plan artifacts

- scripts/plan-canvas.js CLI (open/await/end/stop/server; bin ecc-plan-canvas)
- loopback server + ECC-styled chrome + annotation SDK + zero-dep markdown renderer
- Approve/Request-changes verdicts wired to the /plan confirmation gate
- plan-canvas skill, /plan-canvas command, SessionStart hook surfacing open reviews
- shared scripts/lib/loopback-guard.js extracted from control-pane (API re-exported)
- 121 new tests incl. full-workflow E2E; registered in manifests, catalog, registry

Inspired by lavish-axi (https://github.com/kunchenguid/lavish-axi) by @kunchenguid;
original ECC-native implementation, not a port.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* refactor(plan-canvas): invoke via ecc-plan-canvas bin so the skill works from any project

Skill/command referenced a cwd-relative `node scripts/plan-canvas.js`, unusable
outside the ECC root. Switch to the ecc-plan-canvas bin (and $CLAUDE_PLUGIN_ROOT
fallback) and align CLI next_step hints so an agent can run it as a skill in any repo.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(plan-canvas): render Mermaid diagrams + ship Codex cross-harness surface

- markdown renderer emits <pre class="mermaid"> for ```mermaid blocks (source
  entity-escaped so the browser decodes it for the renderer while blocking injection)
- artifact template loads a pinned Mermaid build only when a diagram is present,
  themed to ECC dark, securityLevel strict, graceful offline fallback to source
  (ECC_PLAN_CANVAS_MERMAID_URL overrides for a local mirror)
- skill teaches Mermaid-for-diagrams and states the CLI+JSON loop is harness-agnostic
- add .agents/skills/plan-canvas (Codex) with agents/openai.yaml interface manifest
- register in install-modules workflow-quality paths; docs updated

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* docs(plan-canvas): add demo screenshot

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(ci): sync yarn.lock with new bin; add contributor checklist

- yarn.lock records the ecc-plan-canvas bin so Yarn hardened-mode install no
  longer wants to modify the lockfile on public PRs
- PR template + CONTRIBUTING gain a pre-push checklist covering the lockfile
  trap and the full skill/command/CLI registration surfaces

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Haley Chen <2022hachen@gmail.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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@ -1,6 +1,6 @@
# Everything Claude Code (ECC) — Agent Instructions
This is a **production-ready AI coding plugin** providing 67 specialized agents, 277 skills, 93 commands, and automated hook workflows for software development.
This is a **production-ready AI coding plugin** providing 67 specialized agents, 278 skills, 94 commands, and automated hook workflows for software development.
**Version:** 2.0.0
@ -152,8 +152,8 @@ Troubleshoot failures: check test isolation → verify mocks → fix implementat
```
agents/ — 67 specialized subagents
skills/ — 277 workflow skills and domain knowledge
commands/ — 93 slash commands
skills/ — 278 workflow skills and domain knowledge
commands/ — 94 slash commands
hooks/ — Trigger-based automations
rules/ — Always-follow guidelines (common + per-language)
scripts/ — Cross-platform Node.js utilities