feat: automated CEM sync CI gate to prevent stale published manifests

[himerus]

Summary

Consumer report from trip-planner project.

Problem: The CEM is baked into the npm package at publish time. If component APIs change after publish but before the next release, consuming projects use stale API data. There is no CI gate that validates the published CEM matches the actual component source.

This has caused multiple issues in trip-planner where Helixir MCP tools returned outdated component info because they read the published CEM.

Proposed solution:

1. CI step that regenerates CEM ...

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Recovered automatically by Automaker post-agent hook

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: dd0d8e21-c3cc-4aa4-a144-a3bba24e95f6

📥 Commits

Reviewing files that changed from the base of the PR and between a5beebe and 6b7c4fc.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (7)

• .changeset/cem-sync-gate.md
• .github/workflows/cem-validate.yml
• custom-elements-manifest.config.cjs
• custom-elements.json
• docs/updating-cem.md
• package.json
• scripts/normalize-cem.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/feat-automated-cem-sync-ci-gate-to

📝 Coding Plan

• Generate coding plan for human review comments

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