chore(release): cut v0.4.0

[nutt-adam]

Summary

• Bump version to 0.4.0
• Update CHANGELOG with all v0.4.0 changes
• Update Cargo.lock

First fully unattended dogfood milestone — tt run sdlc-auto --strict completes all 23 steps end-to-end without operator intervention.

Closes #19, #64, #65, #67

Versioning

• Version bump applied in Cargo.toml
• Cargo.lock updated
• CHANGELOG updated
• SemVer: MINOR (new features, no breaking changes)
• Version: v0.4.0
• Tag: v0.4.0 applied

Test plan

• cargo test --quiet — all 275 tests pass
• cargo fmt --check — clean
• cargo clippy — clean
• cargo publish --dry-run — passes
• Published to crates.io

🤖 Generated with Claude Code

[coderabbitai]

📝 Walkthrough

Walkthrough

Releases version 0.4.0 with changelog documentation detailing new features including PR review merge gate for tt land, tt runs subcommand, HealthState classification enum, and multiple fixes to idle detection, worktree handling, and git operations.

Changes

Cohort / File(s)	Summary
Release 0.4.0 CHANGELOG.md, Cargo.toml	Version bump to 0.4.0. Changelog adds comprehensive release notes documenting new features (PR review loop/merge gate, tt runs subcommand, HealthState enum, verification scripts, new flags), fixes (idle detection, worktree contamination, timeout handling), and schema/behavior changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• chore(release): cut v0.3.0 #60: Release bump affecting Cargo.toml and release metadata files.

Poem

🐰 A version hops forward to point-four,
With fixes and features galore!
Merge gates now guard,
And worktrees stay hard,
While idle detection does soar! 🚀

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the primary change: a version bump release from 0.3.0 to 0.4.0, which aligns with the CHANGELOG and Cargo.toml updates in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description is comprehensive and well-structured, including summary, versioning checklist completion, SemVer choice documentation, test plan validation, and release details.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v0.4.0

📝 Coding Plan

• Generate coding plan for human review comments

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