chore(repo): gitignore local session artifacts (#90)

[w7-mgfcode]

Summary

Add .agents/, .handoffs/, and HANDOFF.md to .gitignore to keep local session artifacts out of the working-tree noise without committing them. Matches the CLAUDE.local.md pattern.

Closes #90.

Test plan

• No tracked files affected (git ls-files shows none of these were previously tracked)
• git status is clean after applying

Summary by Sourcery

Build:

• Update .gitignore to exclude local session artifact directories and files from tracking.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates .gitignore to exclude local session artifacts (.agents/, .handoffs/, HANDOFF.md) from version control, aligning them with existing local-only patterns.

File-Level Changes

Change	Details	Files
Ignore local session artifacts so they are not tracked or shown in git status.	Add .agents/ directory to ignored paths to prevent committing local agent artifacts. Add .handoffs/ directory to ignored paths to keep handoff artifacts local-only. Add HANDOFF.md to ignored files to mirror CLAUDE.local.md-style local documentation patterns.	.gitignore

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