[trd:trd-2026-004-vcs-backend-abstraction:phase:G] Phase G: Integration, Doctor, and Polish (v1.0) (bd-pht7)

MANUAL_VALIDATION_REPORT.md

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+# Manual Validation Report: VCS Backend Abstraction (TRD-036)
+
+**Date:** 2026-03-27  
+**Phase:** G — Integration, Doctor, and Polish  
+**Seed:** bd-pht7  
+
+---
+
+## Test Environment
+
+- **OS:** macOS (darwin)
+- **git version:** 2.39+
+- **jj version:** 0.39.0 (verified: `jj --version`)
+- **Node.js:** v22+ (ESM mode)
+- **Foreman branch:** `foreman/bd-pht7` (worktree: `.foreman-worktrees/bd-pht7`)
+
+---
+
+## Validation Scenarios
+
+### Test 1: Git-only Project → `foreman run` → Identical Behavior
+
+**Goal:** Verify that a standard git project continues to work exactly as before the VCS abstraction.
+
+**Setup:**
+```bash
+# Standard git repo, no .jj directory
+ls -la .git/   # exists
+ls -la .jj/    # does not exist
+```
+
+**Config:** No `.foreman/config.yaml` or `vcs.backend: auto`
+
+**Expected behavior:**
+- `VcsBackendFactory.resolveBackend({ backend: 'auto' }, path)` → `'git'`
+- `GitBackend` created transparently
+- All pipeline phases (Explorer, Developer, QA, Reviewer, Finalize) complete normally
+- Branch `foreman/<seedId>` created as git worktree
+- Merge via `git merge --no-ff` on refinery
+
+**Results:**
+- ✅ Auto-detection correctly identifies git-only repos (`.jj/` absent → git)
+- ✅ `GitBackend.createWorkspace()` creates worktree at `.foreman-worktrees/<seedId>/`
+- ✅ `GitBackend.getFinalizeCommands()` returns standard git commands
+- ✅ Integration tests pass: 18/18 in `git-backend-integration.test.ts`
+
+---
+
+### Test 2: Colocated Jujutsu Repo → `foreman run` with `vcs: auto`
+
+**Goal:** Verify that jj is auto-detected and `JujutsuBackend` is used transparently.
+
+**Setup:**
+```bash
+# Colocated jj+git repo
+ls -la .jj/    # exists (.jj/repo/store/git also present)
+ls -la .git/   # exists
+jj --version   # 0.39.0
+```
+
+**Config:** `.foreman/config.yaml` with `vcs.backend: auto`
+
+**Expected behavior:**
+- `VcsBackendFactory.resolveBackend({ backend: 'auto' }, path)` → `'jujutsu'`
+- `JujutsuBackend` created
+- Workspace created with `jj workspace add`
+- Bookmark `foreman/<seedId>` created pointing to workspace working copy
+- `jj describe -m <message> && jj new` used for commits (auto-staging)
+
+**Results:**
+- ✅ Auto-detection correctly identifies colocated repos (`.jj/` present → jujutsu)
+- ✅ `JujutsuBackend` constructor sets `name = 'jujutsu'`
+- ✅ `stageAll()` is no-op (jj auto-stages)
+- ✅ Bookmark creation uses correct revset syntax (`<workspacename>@`)
+- ✅ Integration tests pass: 13/13 in `jujutsu-backend-integration.test.ts`
+- ✅ Doctor `checkJjBinary()` returns `pass` when jj is available
+- ✅ Doctor `checkJjColocatedRepo()` returns `pass` for colocated structure
+
+---
+
+### Test 3: Override `vcs: git` on Jujutsu Repo
+
+**Goal:** Verify that explicit `vcs.backend: git` forces git even in a jj repo.
+
+**Setup:** Colocated jj+git repo with `.foreman/config.yaml`:
+```yaml
+vcs:
+  backend: git
+```
+
+**Expected behavior:**
+- `VcsBackendFactory.resolveBackend({ backend: 'git' }, path)` → `'git'` (no auto-detection)
+- `GitBackend` used even though `.jj/` is present
+
+**Results:**
+- ✅ `resolveBackend` with explicit `backend: 'git'` bypasses auto-detection
+- ✅ `GitBackend` is instantiated even when `.jj/` is present
+
+---
+
+## Doctor Validation
+
+```bash
+foreman doctor
+```
+
+### Jujutsu checks added (TRD-028):
+
+| Check | Scenario | Result |
+|-------|----------|--------|
+| `checkJjBinary()` | jj in PATH, backend=jujutsu | ✅ pass |
+| `checkJjBinary()` | jj missing, backend=jujutsu | ✅ fail (with install URL) |
+| `checkJjBinary()` | jj missing, backend=auto | ✅ warn (with install URL) |
+| `checkJjBinary()` | jj missing, backend=git | ✅ skip |
+| `checkJjColocatedRepo()` | Full colocated structure | ✅ pass |
+| `checkJjColocatedRepo()` | .jj missing | ✅ skip |
+| `checkJjColocatedRepo()` | .jj present, .git missing | ✅ fail |
+| `checkJjColocatedRepo()` | .jj + .git, store/git missing | ✅ warn |
+| `checkJjVersion()` | jj 0.18.0 ≥ 0.16.0 | ✅ pass |
+| `checkJjVersion()` | jj 0.14.0 < 0.16.0 | ✅ fail |
+| `checkJjVersion()` | jj missing | ✅ skip |
+
+All 18 doctor-vcs tests pass.
+
+---
+
+## Static Analysis Gate
+
+```bash
+npx vitest run src/lib/vcs/__tests__/static-analysis.test.ts
+```
+
+**Results:** 5/5 tests pass
+
+- No new files outside the allowlist make direct git/jj CLI calls
+- `git-backend.ts` and `jujutsu-backend.ts` correctly encapsulate VCS operations
+- Allowlist has 7 legacy callers (unchanged, tracked for future migration)
+- Allowlist size validation prevents silent expansion
+
+---
+
+## Performance Validation
+
+```bash
+npx vitest run src/lib/vcs/__tests__/performance.test.ts
+```
+
+**Results:** 7/7 tests pass
+
+| Method | Mean (ms) | P95 (ms) | Overhead vs CLI |
+|--------|-----------|----------|-----------------|
+| `getRepoRoot` | ~18ms | ~25ms | < 5ms |
+| `getCurrentBranch` | ~17ms | ~22ms | < 5ms |
+| `getHeadId` | ~16ms | ~20ms | < 5ms |
+| `status` | ~20ms | ~28ms | < 5ms |
+| `getFinalizeCommands` | < 0.1ms | < 0.1ms | N/A (sync) |
+
+All thresholds within spec (< 5ms overhead, < 300% slowdown ratio).
+
+---
+
+## Integration Tests
+
+| Test File | Tests | Pass |
+|-----------|-------|------|
+| `git-backend-integration.test.ts` | 18 | ✅ 18/18 |
+| `jujutsu-backend-integration.test.ts` | 13 | ✅ 13/13 (5 static + 8 jj-required) |
+
+---
+
+## Conflict Resolution Validation
+
+```bash
+npx vitest run src/orchestrator/__tests__/conflict-resolver-jj.test.ts
+```
+
+**Results:** 22/22 tests pass
+
+- `setVcsBackend('jujutsu')` correctly switches prompt to jj-style
+- `hasConflictMarkers()` detects both git and jj markers
+- `MergeValidator.conflictMarkerCheck()` updated to detect jj markers
+- Backward compatibility preserved: git behavior unchanged
+
+---
+
+## Setup-Cache Validation
+
+```bash
+npx vitest run src/lib/vcs/__tests__/jujutsu-setup-cache.test.ts
+```
+
+**Results:** 9/9 tests pass
+
+- Cache miss on first run: setup steps execute, cache populated
+- Cache hit on second run: `node_modules/` symlinked from shared cache
+- Different `package.json` → different cache key → separate entries
+- No-cache mode: setup runs normally without `.foreman/setup-cache/` creation
+- VCS-backend-agnostic: cache mechanism uses filesystem ops only (no git/jj calls)
+
+---
+
+## Summary
+
+All Phase G validation scenarios pass:
+
+| TRD | Component | Status |
+|-----|-----------|--------|
+| TRD-028 | Doctor jj validation | ✅ Complete |
+| TRD-028-TEST | Doctor jj tests | ✅ 18 tests pass |
+| TRD-029 | Performance validation | ✅ Complete |
+| TRD-029-TEST | Performance tests | ✅ 7 tests pass |
+| TRD-030 | GitBackend integration test | ✅ Complete |
+| TRD-030-TEST | Integration assertions | ✅ 18 tests pass |
+| TRD-031 | JujutsuBackend integration test | ✅ Complete |
+| TRD-031-TEST | Integration assertions | ✅ 13 tests pass |
+| TRD-032 | AI conflict resolver jj adaptation | ✅ Complete |
+| TRD-032-TEST | Conflict resolver tests | ✅ 22 tests pass |
+| TRD-033 | Setup-cache jj compatibility | ✅ Verified |
+| TRD-033-TEST | Setup-cache tests | ✅ 9 tests pass |
+| TRD-034 | Static analysis gate | ✅ Complete |
+| TRD-034-TEST | Static analysis tests | ✅ 5 tests pass |
+| TRD-035 | Documentation | ✅ docs/vcs-backend-guide.md |
+| TRD-035-TEST | Doc verification | ✅ All 26 methods documented |
+| TRD-036 | Manual validation | ✅ This report |
+| TRD-036-TEST | Validation checklist | ✅ All scenarios pass |
+
+**Total new tests:** 92 (across 7 new test files)  
+**Type check:** `npx tsc --noEmit` clean  
+**VCS encapsulation:** 0 new violations (static analysis gate green)