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Optional YAML frontmatter — include ONLY when the plan was generated from a
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the frontmatter parser does not support flow-style arrays.

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source_findings:
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---
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# {Task Title}

> **Plan quality: {grade}** ({score}/100) — {APPROVE | APPROVE_WITH_NOTES | REVISE | REPLAN}
>
> Generated by trekplan v{version} on {YYYY-MM-DD} — `plan_version: 1.7`

## Context

Why this change is needed. The problem or need it addresses, what prompted it,
and the intended outcome. Reference the spec file if one was used.

## Architecture Diagram

```mermaid
graph TD
    subgraph "Changes in this plan"
        %% C4-style component diagram showing what the plan touches
        %% Highlight modified components, new components, and connections
    end
```

*Replace with actual Mermaid diagram showing the components this plan modifies,
their relationships, and the data flow between them.*

## Codebase Analysis

- **Tech stack:** {languages, frameworks, build tools}
- **Key patterns:** {architecture patterns, conventions observed}
- **Relevant files:** {paths to files that will be read or modified}
- **Reusable code:** {existing functions, utilities, abstractions to leverage}
- **External tech (researched):** {technologies that were looked up via research-scout}
- **Recent git activity:** {relevant recent commits, active branches, code ownership}

## Research Sources

*Omit this section when no external research was conducted.*

| Technology | Source | Key Findings | Confidence |
|-----------|--------|--------------|------------|
| {name}    | {URL}  | {summary}    | {high/med/low} |

## Implementation Plan

Each step targets 1–2 files and one focused change. Steps follow TDD structure
when the project has tests.

### Step 1: {description}

- **Files:** `path/to/file.ts`
- **Changes:** {exactly what to modify — no placeholders, no "update as needed"}
- **Reuses:** {existing function/pattern from codebase, with file path}
- **Test first:**
  - File: `path/to/test.ts` *(existing | new)*
  - Verifies: {what the test checks}
  - Pattern: `path/to/existing-test.ts` *(follow this style)*
- **Verify:** `{exact command}` → expected: `{output}`
- **On failure:** {revert | retry | skip | escalate} — {specific instructions}
- **Checkpoint:** `git commit -m "{conventional commit message}"`
- **Manifest:**
  ```yaml
  manifest:
    expected_paths:
      - path/to/file.ts
    min_file_count: 1
    commit_message_pattern: "^feat\\(scope\\):"
    bash_syntax_check: []
    forbidden_paths: []
    must_contain: []
  ```

### Step 2: {description}

- **Files:** `path/to/file.ts`
- **Changes:** {exactly what to modify}
- **Reuses:** {existing function/pattern}
- **Test first:**
  - File: `path/to/test.ts` *(existing | new)*
  - Verifies: {what the test checks}
  - Pattern: `path/to/existing-test.ts`
- **Verify:** `{exact command}` → expected: `{output}`
- **On failure:** {revert | retry | skip | escalate} — {specific instructions}
- **Checkpoint:** `git commit -m "{conventional commit message}"`
- **Manifest:**
  ```yaml
  manifest:
    expected_paths:
      - path/to/file.ts
    min_file_count: 1
    commit_message_pattern: "^feat\\(scope\\):"
    bash_syntax_check: []
    forbidden_paths: []
    must_contain:
      - path: path/to/file.ts
        pattern: "expected content marker"
  ```

*For projects without tests: omit "Test first" and keep "Verify" with a
concrete command (e.g., run the app, check output, curl an endpoint).*

### Manifest — objective completion predicate

Every step MUST have a Manifest block. This is the machine-checkable contract
that trekexecute verifies after the Verify command passes. A step is
not considered complete until its manifest verifies — regardless of Verify
command exit code.

- **expected_paths** — files that must exist after this step. Existing files
  must be present in repo; new files must be marked `(new file)` in prose.
- **min_file_count** — minimum number of expected_paths that must exist.
  Typically equal to `len(expected_paths)`.
- **commit_message_pattern** — regex that MUST match the HEAD commit message
  after Checkpoint runs. Use escaped regex syntax (e.g., `\\(scope\\)`).
- **bash_syntax_check** — list of `.sh` files that must pass `bash -n`.
  Auto-include any `.sh` in expected_paths.
- **forbidden_paths** — files this step must NOT modify (defense-in-depth
  beyond Scope Fence).
- **must_contain** — optional grep assertions: `path` + `pattern` pairs that
  must match in created/modified files.

### Failure recovery rules

- **On failure: revert** — undo this step's changes (`git checkout -- {files}`), do NOT proceed
- **On failure: retry** — attempt once more with the alternative approach described, then revert if still failing
- **On failure: skip** — this step is non-critical; continue to next step and note the skip
- **On failure: escalate** — stop execution entirely; the issue requires human judgment
- **Checkpoint** — after each step succeeds, commit changes so subsequent failures cannot corrupt completed work

## Alternatives Considered

| Approach | Pros | Cons | Why rejected |
|----------|------|------|--------------|
| {name}   | ...  | ...  | ...          |

## Test Strategy

- **Framework:** {test framework and runner}
- **Existing patterns:** {how tests are structured in this codebase}
- **New tests in this plan:** {N} tests across {N} steps

### Tests to write

| Type | File | Verifies | Model test |
|------|------|----------|------------|
| Unit | `path/to/test` | {what it tests} | `path/to/existing-test` |

*For projects without tests: describe manual verification approach instead.*

## Risks and Mitigations

| Priority | Risk | Location | Impact | Mitigation |
|----------|------|----------|--------|------------|
| {Critical/High/Medium/Low} | {description} | `file:line` | {what happens} | {how to handle} |

## Assumptions

*Things the planner could not verify from codebase or research. Each assumption
is a risk — review before executing.*

| # | Assumption | Why unverifiable | Impact if wrong |
|---|-----------|-----------------|-----------------|
| 1 | {what we assumed} | {why we couldn't check} | {what breaks} |

*If this list has 3+ items, the plan may need additional investigation
before execution.*

## Verification

*Per-step manifest verification runs automatically during execution (every
step's Manifest block is objectively checked by trekexecute before the
step is marked passed). This section is for end-to-end integration checks
that cross step boundaries — complete workflows, system-level behavior.*

- [ ] `{exact command}` → expected: `{exact output or behavior}`
- [ ] `{exact command}` → expected: `{exact output or behavior}`

## Estimated Scope

- **Files to modify:** {N}
- **Files to create:** {N}
- **Complexity:** {low | medium | high}

## Execution Strategy

*Include this section when the plan has more than 5 implementation steps.
Omit for small plans (≤ 5 steps) — trekexecute will run them sequentially
in a single session.*

*The execution strategy groups steps into sessions and organizes sessions
into waves. Sessions in the same wave can run in parallel. Sessions in
later waves depend on earlier waves completing first.*

### Session 1: {title}
- **Steps:** {step numbers, e.g., 1, 2, 3}
- **Wave:** {wave number}
- **Depends on:** {session numbers, or "none"}
- **Scope fence:**
  - Touch: {files this session may modify}
  - Never touch: {files reserved for other sessions}

### Session 2: {title}
- **Steps:** {step numbers}
- **Wave:** {wave number}
- **Depends on:** {session numbers, or "none"}
- **Scope fence:**
  - Touch: {files}
  - Never touch: {files}

### Execution Order

- **Wave 1:** {session list} (parallel)
- **Wave 2:** {session list} (after Wave 1)

### Grouping rules applied

- Steps sharing files → same session
- Steps in independent modules → separate sessions (parallelizable)
- 3–5 steps per session (target)
- Sessions ordered by dependency, waves by independence

## Plan Quality Score

| Dimension | Weight | Score | Notes |
|-----------|--------|-------|-------|
| Structural integrity | 0.15 | {0–100} | {step ordering, dependencies} |
| Step quality | 0.20 | {0–100} | {granularity, specificity, TDD} |
| Coverage completeness | 0.20 | {0–100} | {spec → steps, no gaps} |
| Specification quality | 0.15 | {0–100} | {no placeholders, clear criteria} |
| Risk & pre-mortem | 0.15 | {0–100} | {failure modes addressed} |
| Headless readiness | 0.10 | {0–100} | {On failure + Checkpoint per step} |
| Manifest quality | 0.05 | {0–100} | {all steps have valid, checkable manifests} |
| **Weighted total** | **1.00** | **{score}** | **Grade: {A/B/C/D}** |

**Adversarial review:**
- **Plan critic:** {verdict — findings count by severity, key issues}
- **Scope guardian:** {verdict — ALIGNED / CREEP / GAP / MIXED}

## Revisions

*Added by adversarial review. Omit if no revisions were needed.*

| # | Finding | Severity | Resolution |
|---|---------|----------|------------|
| 1 | {what was wrong} | {blocker/major/minor} | {how it was fixed} |
