Add lint command

docs/ai/design/feature-lint-command.md

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+---
+phase: design
+title: System Design & Architecture
+description: Define the technical architecture, components, and data models
+---
+
+# System Design & Architecture
+
+## Architecture Overview
+**What is the high-level system structure?**
+
+```mermaid
+graph TD
+  User --> CLI[ai-devkit lint command]
+  CLI --> ArgParser[Feature and output argument parser]
+  ArgParser --> LintService[Lint validation service]
+  LintService --> BaseCheck[Base docs checker]
+  LintService --> FeatureCheck[Feature docs checker]
+  LintService --> GitCheck[Worktree and branch checker]
+  BaseCheck --> FS[(File System)]
+  FeatureCheck --> FS
+  GitCheck --> Git[(Git metadata)]
+  CLI --> Reporter[Terminal and JSON reporter]
+```
+
+- Key components and responsibilities
+  - `lint` command handler: parse options and orchestrate checks.
+  - Name normalizer: convert `--feature` input into canonical `<name>` and `feature-<name>` (accept `foo` and `feature-foo`).
+  - Base docs checker: validate required phase template files (`docs/ai/*/README.md`).
+  - Feature docs checker: validate `docs/ai/{phase}/feature-<name>.md` across lifecycle phases.
+  - Git/worktree checker: evaluate feature branch/worktree convention used by `dev-lifecycle` Phase 1 prerequisite.
+  - Reporter (command-owned): consistent output rows (`[OK]`, `[MISS]`, `[WARN]`) and final summary with exit code.
+- Technology stack choices and rationale
+  - TypeScript within existing CLI package for shared UX and testability.
+  - Extract shell script checks into reusable TS utilities to avoid behavior drift.
+  - Git checks via lightweight git commands (`git worktree list`, branch existence checks) to preserve compatibility.
+
+## Data Models
+**What data do we need to manage?**
+
+- Core entities and their relationships
+  - `LintOptions`: parsed CLI options.
+  - `LintTarget`: normalized feature identity (`name`, `branchName`, `docSlug`).
+  - `LintCheckResult`: result of individual check.
+  - `LintSummary`: aggregate counts and final status.
+- Data schemas/structures
+  - `LintOptions`
+    - `{ feature?: string, json?: boolean }`
+  - `LintTarget`
+    - `{ rawFeature: string, normalizedName: string, branchName: string, docFilePrefix: string }`
+  - `LintCheckResult`
+    - `{ id: string, level: 'ok' | 'miss' | 'warn', category: 'base-docs' | 'feature-docs' | 'git-worktree', required: boolean, message: string, fix?: string }`
+  - `LintSummary`
+    - `{ checks: LintCheckResult[], hasRequiredFailures: boolean, warningCount: number }`
+- Data flow between components
+  - Parse args -> normalize feature -> run applicable checks -> collect results -> render terminal or JSON output -> return exit code.
+
+## API Design
+**How do components communicate?**
+
+- External APIs (if applicable)
+  - CLI invocations:
+    - `ai-devkit lint`
+    - `ai-devkit lint --feature <name>`
+    - `ai-devkit lint --feature <name> --json`
+- Internal interfaces
+  - `runLintChecks(options, dependencies?): LintReport`
+  - `renderLintReport(report, options): void` (in `commands/lint`)
+  - `normalizeFeatureName(input): string`
+  - `isInsideGitWorkTreeSync(cwd): boolean`
+  - `localBranchExistsSync(cwd, branchName): boolean`
+  - `getWorktreePathsForBranchSync(cwd, branchName): string[]`
+- Request/response formats
+  - Input: CLI flags and current working directory.
+  - Output:
+    - Default: human-readable checklist and summary.
+    - `--json`: structured JSON object for CI parsing (checks, counts, normalized feature, pass/fail state).
+  - Exit code policy:
+    - `0`: no required failures.
+    - `1`: one or more required failures.
+    - Warnings (including missing dedicated worktree) do not change exit code when required checks pass.
+- Authentication/authorization approach
+  - Read-only operations only (filesystem + git metadata queries).
+
+## Component Breakdown
+**What are the major building blocks?**
+
+- Frontend components (if applicable)
+  - Terminal output formatter using existing CLI conventions.
+  - JSON formatter for machine-readable mode.
+- Backend services/modules
+  - `commands/lint` command entry.
+  - `services/lint/lint.service.ts` for orchestration and business rules only.
+  - `services/lint/rules/*` for modular validation rules (base docs, feature docs, feature-name, git worktree).
+  - `util/git` sync helpers for git/worktree checks.
+  - `util/terminal-ui` for consistent terminal output formatting.
+- Database/storage layer
+  - None.
+- Third-party integrations
+  - Local git executable.
+
+## Design Decisions
+**Why did we choose this approach?**
+
+- Key architectural decisions and trade-offs
+  - Re-implement shell checks in TypeScript while keeping output semantics:
+    - Pros: testable, reusable, cross-command integration.
+    - Cons: initial duplication until script is retired/repointed.
+  - Classify checks as required vs warning:
+    - Pros: keeps lifecycle gating strict for missing docs while allowing advisory worktree guidance.
+    - Cons: users may ignore warnings if not enforced in team policy.
+  - Normalize feature names automatically:
+    - Pros: better UX (`foo` and `feature-foo` both accepted).
+    - Cons: requires clear messaging of normalized value.
+  - Include `--json` output in v1:
+    - Pros: CI-friendly parsing and automated reporting.
+    - Cons: requires stable output schema maintenance.
+- Alternatives considered
+  - Keep shell script only and wrap it from CLI:
+    - Rejected due to weaker cross-platform consistency and lower unit-test coverage.
+  - Hard-fail when dedicated worktree is missing:
+    - Rejected; requirement is warning-only behavior for this condition.
+- Patterns and principles applied
+  - Single-responsibility check modules.
+  - Deterministic output for CI and humans.
+  - Collect-all-results reporting to surface all issues in one run.
+  - Avoid shell interpolation for git operations by using argument-based command execution.
+
+## Non-Functional Requirements
+**How should the system perform?**
+
+- Performance targets
+  - Complete typical checks in under 1 second on standard repositories.
+- Scalability considerations
+  - Check implementation should be extensible for additional lifecycle validations later.
+- Security requirements
+  - No file writes or mutations.
+  - No network access required.
+- Reliability/availability needs
+  - Command should gracefully handle missing git repo context and provide actionable fixes.

docs/ai/implementation/feature-lint-command.md

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+---
+phase: implementation
+title: Implementation Guide
+description: Technical implementation notes, patterns, and code guidelines
+---
+
+# Implementation Guide
+
+## Development Setup
+**How do we get started?**
+
+- `npm install` at repository root.
+- CLI package local validation commands:
+  - `npm run lint` (from `packages/cli`)
+  - `nx run cli:test -- --runInBand lint.test.ts` (from repo root)
+
+## Code Structure
+**How is the code organized?**
+
+- `packages/cli/src/cli.ts`
+  - Registers new `lint` command and options (`--feature`, `--json`).
+- `packages/cli/src/commands/lint.ts`
+  - Command entrypoint that runs checks, renders output, and sets process exit code.
+- `packages/cli/src/services/lint/lint.service.ts`
+  - Core lint orchestration and business logic only (no terminal rendering).
+- `packages/cli/src/services/lint/rules/`
+  - Rule modules split by concern (`base-docs`, `feature-name`, `feature-docs`, `git-worktree`).
+- `packages/cli/src/__tests__/services/lint/lint.test.ts`
+  - Unit coverage for normalization and check outcomes.
+- `packages/cli/src/__tests__/commands/lint.test.ts`
+  - Command-level coverage for orchestration and exit-code behavior.
+
+## Implementation Notes
+**Key technical details to remember:**
+
+### Core Features
+- Base readiness checks validate `docs/ai/{requirements,design,planning,implementation,testing}/README.md`.
+- Feature mode normalizes `feature-<name>` and `<name>` into a shared `normalizedName`.
+- Feature names are validated as kebab-case before running feature-level checks.
+- Feature mode validates lifecycle docs:
+  - `docs/ai/{phase}/feature-<normalizedName>.md`
+- Git validation behavior:
+  - Missing git repository => required failure.
+  - Missing `feature-<name>` branch => required failure.
+  - Missing dedicated worktree for branch => warning only.
+- Command rendering supports:
+  - human-readable checklist output
+  - JSON report output with summary and per-check metadata
+
+### Patterns & Best Practices
+- `runLintChecks` accepts injected dependencies (`cwd`, `existsSync`, `execFileSync`) for testability.
+- Shared phase-doc rule helper keeps base/feature doc checks consistent while avoiding duplication.
+- Check results use a normalized shape (`LintCheckResult`) so rendering and JSON use one source of truth.
+- Required failures drive exit code; warnings are advisory only.
+
+## Integration Points
+**How do pieces connect?**
+
+- CLI wiring: Commander action in `packages/cli/src/cli.ts` calls `lintCommand`.
+- `lintCommand` delegates to `runLintChecks` then `renderLintReport`.
+- `lint.service` composes rule modules and uses `util/git` sync helpers to query `git rev-parse`, `git show-ref`, and `git worktree list --porcelain`.
+- `commands/lint` owns `renderLintReport` and uses `util/terminal-ui` for consistent user-facing output.
+
+## Error Handling
+**How do we handle failures?**
+
+- Git command failures are converted into deterministic lint results (miss or warn), not thrown errors.
+- Missing files are reported with explicit path and remediation guidance.
+- Output includes suggested fixes (for example `npx ai-devkit init`, `git worktree add ...`).
+
+## Performance Considerations
+**How do we keep it fast?**
+
+- Uses direct existence checks and small git commands only.
+- No recursive repository scans or network calls.
+
+## Security Notes
+**What security measures are in place?**
+
+- Read-only filesystem and git metadata checks only.
+- No mutation of repository state.
+- Git commands use argument-based process execution (`execFileSync`) to avoid shell interpolation risks from user input.
+
+## Phase 6 Check Implementation
+
+- Design/requirements alignment: aligned for command surface, normalization, check categories, and exit behavior.
+- Deviations and gaps:
+  - Full CLI binary execution via `npm run dev -- lint ...` is currently blocked by unrelated pre-existing TypeScript errors in `src/commands/memory.ts`.
+
+## Phase 8 Code Review
+
+- Blocking issue found and resolved:
+  - `packages/cli/src/services/lint/lint.service.ts`: replaced shell-command interpolation with argument-based git execution and added feature-name validation.
+- Remaining non-blocking gap:
+  - Full CLI binary execution remains blocked by unrelated pre-existing TypeScript issues outside this feature.

docs/ai/planning/feature-lint-command.md

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+---
+phase: planning
+title: Project Planning & Task Breakdown
+description: Break down work into actionable tasks and estimate timeline
+---
+
+# Project Planning & Task Breakdown
+
+## Milestones
+**What are the major checkpoints?**
+
+- [x] Milestone 1: Lint requirements/design approved
+- [x] Milestone 2: `ai-devkit lint` base + feature checks implemented
+- [x] Milestone 3: Tests, docs, and rollout complete
+
+## Task Breakdown
+**What specific work needs to be done?**
+
+### Phase 1: Foundation
+- [x] Task 1.1: Audit current CLI command registration and identify insertion point for `lint`
+- [x] Task 1.2: Extract/reimplement `check-docs.sh` base and feature doc checks in TypeScript utilities
+- [x] Task 1.3: Implement feature-name normalization utility (`foo` and `feature-foo` -> `foo`)
+- [x] Task 1.4: Define shared lint result model and formatter (`ok/miss/warn`, remediation hints)
+
+### Phase 2: Core Features
+- [x] Task 2.1: Add `ai-devkit lint` command handler with base workspace checks
+- [x] Task 2.2: Add `--feature <name>` mode with feature doc checks across all lifecycle phases
+- [x] Task 2.3: Add git checks for `feature-<name>` branch/worktree presence and mapping
+- [x] Task 2.4: Ensure proper exit codes and summary output for CI compatibility
+
+### Phase 3: Integration & Polish
+- [x] Task 3.1: Update help text and README command documentation
+- [x] Task 3.2: Decide whether to keep `skills/dev-lifecycle/scripts/check-docs.sh` as wrapper or migrate references to `ai-devkit lint`
+- [x] Task 3.3: Add actionable remediation guidance in failures (`npx ai-devkit init`, worktree creation command)
+- [x] Task 3.4: Validate behavior against existing lifecycle docs and feature naming conventions
+
+### Phase 4: Validation
+- [x] Task 4.1: Unit tests for base docs checks and feature docs checks
+- [x] Task 4.2: Unit tests for feature normalization and git/worktree validation logic
+- [x] Task 4.3: Integration tests for CLI exit codes and terminal output
+- [x] Task 4.4: Manual verification on repositories with and without required docs/worktrees
+
+## Dependencies
+**What needs to happen in what order?**
+
+- Task dependencies and blockers
+  - Command registration and result model must be in place before integration tests.
+  - Feature-name normalization should be implemented before feature doc and git checks.
+  - Git check module should be stable before finalizing remediation messages.
+- External dependencies (APIs, services, etc.)
+  - Local git executable availability for feature-level checks.
+- Team/resource dependencies
+  - Maintainer review for lifecycle workflow compatibility and naming conventions.
+
+## Timeline & Estimates
+**When will things be done?**
+
+- Estimated effort per task/phase
+  - Phase 1: 0.5-1 day
+  - Phase 2: 1-1.5 days
+  - Phase 3: 0.5 day
+  - Phase 4: 0.5-1 day
+- Target dates for milestones
+  - Milestone 1: day 1
+  - Milestone 2: day 2-3
+  - Milestone 3: day 3-4
+- Buffer for unknowns
+  - +20% for git/worktree edge-case handling and cross-platform output differences
+
+## Risks & Mitigation
+**What could go wrong?**
+
+- Technical risks
+  - Git worktree detection may vary by repo state and user flow.
+  - Divergence between shell script and new TypeScript checks can cause inconsistent behavior.
+- Resource risks
+  - Limited test coverage for unusual git/worktree layouts.
+- Dependency risks
+  - Existing scripts or docs may still assume `check-docs.sh` behavior/output.
+- Mitigation strategies
+  - Add fixture-based tests for multiple git states.
+  - Keep output mapping close to existing `check-docs.sh` semantics initially.
+  - Update docs and scripts in same change to avoid workflow drift.
+
+## Resources Needed
+**What do we need to succeed?**
+
+- Team members and roles
+  - CLI implementer and reviewer
+- Tools and services
+  - Existing TypeScript unit/integration test tooling
+- Infrastructure
+  - Local git repo fixtures for worktree tests
+- Documentation/knowledge
+  - Dev-lifecycle skill conventions and existing `check-docs.sh` behavior