feature: mcp + CLI agent references

[Rodriguespn]

Summary

Adds 17 reference files covering CLI commands, MCP setup, and combined tooling workflows:

• CLI (cli-*): 8 files covering project, database, migration, functions, secrets, and generation commands. Includes a decision guide (pull vs diff, push vs up) and common gotchas/pitfalls
• MCP (mcp-*): 3 files for MCP server configuration, feature groups, and security considerations
• Tooling (tooling-*): 6 files for tool selection (MCP vs CLI), capability overlap, and combined workflows (local dev, migration creation, type generation, function development)

Key principle: prefer MCP tools when connected (self-describing schemas), use CLI for local-only operations (start, stop, reset) and file generation. Includes suggestions from code review (thanks @sweatybridge, @jorgoose). Updates SKILL.md, AGENTS.md, and _sections.md.

[Rodriguespn]

@sweatybridge commented on closed PR

just some minor comments. I wonder if we can include supabase test db as one of the skills?

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

🗂️ Base branches to auto review (2)

• !master
• !main

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.

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
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/mcp-agent-references

---

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