[codex] Add reduced debug inspection package

[brianmhunt]

What changed

This PR adds a reduced first slice of @tko/debug.

It introduces a small runtime inspection package with:

• node inspection for bound DOM/context summary
• observable inspection for current value metadata, subscriptions, and computed dependency info
• lightweight preview helpers for safe summarized output
• focused package tests around bound nodes, observables, direct paths, and non-evaluating pure computed inspection

Why

This keeps the first implementation deliberately small so we can validate the package shape before adding higher-risk bridge or MCP-facing behavior.

Impact

• no MCP transport yet
• no browser bridge yet
• no context-path resolution layer yet
• small enough to review and extend incrementally

Validation

• make test-headless in packages/debug
• result: 5 SUCCESS

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 81222fbf-c64c-4d0a-b148-af6aad907a5a

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/tko-mcp-debug-plan

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}