chore: add mdformat 1.0.0 pre-commit hook

[jamestexas]

Summary

• Add mdformat 1.0.0 pre-commit hook with gfm + frontmatter plugins
• Excludes .beads/ directory

Test plan

• pre-commit run mdformat --all-files passes

[Copilot]

Pull request overview

Adds Markdown formatting via mdformat to the existing pre-commit setup, and introduces repository-level Beads (bd) issue-tracking onboarding/configuration files (plus Dolt-related .gitignore entries).

Changes:

• Add mdformat (with GFM + frontmatter plugins) as a pre-commit hook, excluding .beads/.
• Add Beads onboarding/docs/config under .beads/ and a new AGENTS.md with workflow instructions.
• Update .gitignore to ignore Dolt/DB artifacts.

Reviewed changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
AGENTS.md	Adds agent workflow guidance and Beads usage instructions.
.pre-commit-config.yaml	Adds mdformat pre-commit hook and excludes .beads/ from formatting.
.gitignore	Ignores .dolt/ and *.db artifacts.
.beads/metadata.json	Adds Beads/Dolt project metadata.
.beads/config.yaml	Adds Beads configuration template/comments.
.beads/README.md	Adds Beads overview and quick-start info.
.beads/.gitignore	Ignores Beads runtime/ephemeral artifacts under .beads/.
.beads/interactions.jsonl	Adds an (currently empty) JSONL file under .beads/.
.beads/hooks/prepare-commit-msg	Adds Beads-managed git hook wrapper.
.beads/hooks/pre-push	Adds Beads-managed git hook wrapper.
.beads/hooks/pre-commit	Adds Beads-managed git hook wrapper.
.beads/hooks/post-merge	Adds Beads-managed git hook wrapper.
.beads/hooks/post-checkout	Adds Beads-managed git hook wrapper.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.