fix: address PR review comments and markdown lint issues

[UserAd]

Summary

• Use strings.HasPrefix for clearer intent in test assertions
• Document edge case when both FindGitRoot and Getwd fail in MailmanStop
• Fix markdown lint errors (MD032, MD031, MD022, MD040, MD033)
• Escape <error> in spec docs to avoid inline HTML warnings

Test plan

• All tests pass (go test -v ./internal/cli/... -run MailmanStop)
• Markdown lint errors reduced from 79 to 58 (remaining are MD060 table style - cosmetic only)

Summary by CodeRabbit

• Documentation

  • Expanded and clarified stop-command docs, daemon responsibilities, examples, and exit-code sections; added post-implementation checklist and minor formatting improvements.

• Tests

  • Adjusted tests to use a standard library helper for error-prefix checks and added test descriptions to quickstart.

• Chores

  • Formatting and presentation refinements across specification and research documents.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Adds documentation comments to the MailmanStop function, replaces a manual prefix check with strings.HasPrefix in a test, and updates multiple mailman-stop specification documents (contracts, data model, plan, quickstart, research, spec, tasks) with clarifications and formatting changes.

Changes

Cohort / File(s)	Summary
CLI code & tests internal/cli/mailman_stop.go, internal/cli/mailman_stop_test.go	Added doc comments to MailmanStop describing repo-root resolution behavior; replaced manual error-prefix check with strings.HasPrefix in a test.
Spec: contracts & docs specs/012-mailman-stop/contracts/cli.md, specs/012-mailman-stop/data-model.md, specs/012-mailman-stop/plan.md, specs/012-mailman-stop/quickstart.md, specs/012-mailman-stop/research.md, specs/012-mailman-stop/spec.md, specs/012-mailman-stop/tasks.md	Expanded Fire-and-Forget and daemon responsibility bullets, added stop-file detection operation to data model, escaped angle-bracketed error text in spec, and applied formatting/whitespace edits and quickstart test notes.
Docs: project guidance & README CLAUDE.md, README.md	Added a post-implementation checklist and expanded workflow/technology notes in CLAUDE.md; updated README mailman section with a stop subcommand, separate start/stop exit-code sections, examples, and minor wording/formatting changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: add mailman stop command for graceful daemon shutdown #34: Touches the same mailman stop feature and modifies the CLI, tests, and spec files referenced in this PR.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title references addressing PR review comments and markdown lint issues, which aligns with the PR objectives of fixing markdown lint errors, documenting edge cases, and improving test assertions.

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📜 Recent review details

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a9312f6 and a291b41.

📒 Files selected for processing (2)

• CLAUDE.md
• README.md

🧰 Additional context used

📓 Path-based instructions (1)

README.md

📄 CodeRabbit inference engine (CLAUDE.md)

After implementing a specification, always update README.md to reflect the new functionality

Files:

• README.md

🧠 Learnings (4)

📚 Learning: 2026-01-18T04:45:41.353Z

Learnt from: CR
Repo: UserAd/AgentMail PR: 0
File: CLAUDE.md:0-0
Timestamp: 2026-01-18T04:45:41.353Z
Learning: Applies to README.md : After implementing a specification, always update `README.md` to reflect the new functionality

Applied to files:

• CLAUDE.md

📚 Learning: 2026-01-18T04:45:41.353Z

Learnt from: CR
Repo: UserAd/AgentMail PR: 0
File: CLAUDE.md:0-0
Timestamp: 2026-01-18T04:45:41.353Z
Learning: Feature specifications should use speckit workflow commands from `.claude/commands/` including `/speckit.specify`, `/speckit.plan`, `/speckit.tasks`, `/speckit.implement`, `/speckit.clarify`, `/speckit.analyze`, `/speckit.checklist`, `/speckit.constitution`, and `/speckit.taskstoissues`

Applied to files:

• CLAUDE.md

📚 Learning: 2026-01-18T04:45:41.353Z

Learnt from: CR
Repo: UserAd/AgentMail PR: 0
File: CLAUDE.md:0-0
Timestamp: 2026-01-18T04:45:41.353Z
Learning: Applies to .github/workflows/*.{yaml,yml} : GitHub Actions CI workflow must run formatting check with `gofmt -l .`, dependency verification with `go mod verify`, static analysis with `go vet ./...`, tests with `go test -v -race -coverprofile=coverage.out ./...`, vulnerability check with `govulncheck ./...`, and security scan with `gosec ./...`

Applied to files:

• CLAUDE.md

📚 Learning: 2026-01-18T04:45:41.353Z

Learnt from: CR
Repo: UserAd/AgentMail PR: 0
File: CLAUDE.md:0-0
Timestamp: 2026-01-18T04:45:41.353Z
Learning: AgentMail CLI requires running inside a tmux session and uses `agentmail send <recipient> "<message>"` to send messages and `agentmail receive` to read oldest unread message

Applied to files:

• README.md

🔇 Additional comments (2)

CLAUDE.md (1)

81-89: Nice documentation guardrail.

The post-implementation checklist is clear and reinforces keeping README/specs/examples in sync.

README.md (1)

231-278: Docs for mailman stop are clear and structured.

The new subcommand, behavior notes, examples, and split exit codes read well and align with the intended UX.

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