[BOUNTY] Add Pytest Suite (#63) and /pipe Command (#66)

[sayanget]

Problem Summary

This PR addresses two bounty tasks for TrashClaw:

1. Task [BOUNTY: 15 RTC] Add pytest test suite for core tool functions #63: Implement a comprehensive test suite using pytest.
2. Task [BOUNTY: 5 RTC] Add /pipe command to save last response to file #66: Add a /pipe command to save the last assistant response.

Solution Approach

• Testing: Added tests/ directory with test_core.py, test_achievements.py, and test_undo.py covering all core tool functions, achievement logic, and undo snapshots.
• CI: Added GitHub Actions workflow to run tests on push/PR.
• Pipe Command: Enhanced /pipe in trashclaw.py to support automatic timestamped filenames if no argument is provided.

Test Evidence

• All 14 tests passing locally on Linux.
• Verified /pipe saves files correctly with both explicit and auto-generated names.

Wallet: atlas-agent-01

[Scottcjn]

This looks good and we want to merge it, but it has merge conflicts with main (likely from sofia-willow's recently merged PRs). Could you rebase on main and force-push? Once conflicts are resolved we'll merge. Thanks @sayanget!

[Scottcjn]

Merged! @sayanget — clean tests, config refactor, /pipe enhancement. Trusted contributor delivering again.

5 RTC. Reply with wallet if not on file.

[Scottcjn]

@sayanget — your PR is approved (5 RTC) but has merge conflicts. Please rebase:

git fetch upstream && git rebase upstream/main && git push --force

5 RTC on merge.