# Diff Analysis: Tasklist-Index Comparison

## Metadata
- Generated: 2026-03-05T00:00:00Z
- Variants compared: 2
- Variant A: `.dev/releases/GPT5.4/v2.13-CLIRunner-PipelineUnification/tasklist-index.md` (hereafter "GPT5.4")
- Variant B: `.dev/releases/OPUS4.6/v2.13-CLIRunner-PipelineUnification/tasklist/tasklist-index.md` (hereafter "OPUS4.6")
- Total differences found: 28
- Categories: structural (5), content (12), contradictions (4), unique (7)

## Structural Differences

| # | Area | GPT5.4 (A) | OPUS4.6 (B) | Severity |
|---|------|-------------|-------------|----------|
| S-001 | TASKLIST_ROOT path | Hardcoded absolute: `.dev/releases/GPT5.4/v2.13-CLIRunner-PipelineUnification/` | Uses `TASKLIST_ROOT` variable: `TASKLIST_ROOT/` prefix throughout | Medium |
| S-002 | Artifact path format per deliverable | 3-file set per deliverable: `spec.md`, `notes.md`, `evidence.md` | 1-2 files per deliverable: `evidence.md` (always), `spec.md` (STRICT only) | High |
| S-003 | Checkpoint report template | Embedded as bullet-indented subsections within markdown | Embedded as heading-level sections (## Status, ## Verification Results) | Low |
| S-004 | Phase file artifact paths | Absolute paths in every task and deliverable row | TASKLIST_ROOT-relative paths throughout | Medium |
| S-005 | Traceability matrix confidence format | Visual bar `[████████--] 80%` | Percentage only `85%` | Low |

## Content Differences

| # | Topic | GPT5.4 (A) Approach | OPUS4.6 (B) Approach | Severity |
|---|-------|---------------------|---------------------|----------|
| C-001 | Total task count | 13 tasks across 4 phases | 20 tasks across 4 phases | High |
| C-002 | Total deliverables | 13 deliverables (D-0001 to D-0013) | 20 deliverables (D-0001 to D-0020) | High |
| C-003 | Phase 1 task scope | 4 tasks, all STANDARD; characterization "plans" (spec docs) | 4 tasks, all STANDARD; actual test file creation with concrete commands | Medium |
| C-004 | Phase 2 task count | 4 tasks (T02.01-T02.04); tier: 2 STRICT, 2 STANDARD | 7 tasks (T02.01-T02.07); tier: 3 STRICT, 3 STANDARD, 1 EXEMPT | High |
| C-005 | Phase 2 granularity | Combines hook base + on_exit + migration into 2 tasks (T02.02, T02.03) | Splits into 5 tasks: T02.02 (hook params), T02.03 (on_exit call), T02.04 (factories), T02.05 (wiring + override deletion), T02.06 (NFR-007 check) | High |
| C-006 | Phase 3 task count | 2 tasks (T03.01-T03.02) | 3 tasks (T03.01-T03.03); splits embed helper, step modification, and integration test | Medium |
| C-007 | Phase 4 task count | 3 tasks (T04.01-T04.03), all STANDARD | 6 tasks (T04.01-T04.06), all EXEMPT | High |
| C-008 | Phase 4 tier classification | All STANDARD (direct test execution verification) | All EXEMPT (skip verification -- read-only validation) | High |
| C-009 | Roadmap item registry | 17 items (R-001 to R-017); includes preamble context items (R-001 to R-003) | 20 items (R-001 to R-020); only deliverable-producing items, 1:1 with tasks | Medium |
| C-010 | Effort sizing | Mostly M with some L and S; no XS | Uses XS, S, M; no L effort | Medium |
| C-011 | Phase 1 task dependencies | Sequential chain: T01.01 -> T01.02 -> T01.03 -> T01.04 | All independent (no inter-task dependencies within Phase 1) | High |
| C-012 | Phase 1 deliverable specificity | "Characterization plan" documents | Concrete test files with exact names, case counts, and pytest commands | High |

## Contradictions

| # | Point of Conflict | GPT5.4 (A) Position | OPUS4.6 (B) Position | Impact |
|---|-------------------|---------------------|---------------------|--------|
| X-001 | Phase 1 task dependencies | T01.01->T01.02->T01.03->T01.04 (strict sequential chain) | All Phase 1 tasks have "Dependencies: None" (fully parallel) | High |
| X-002 | Phase 4 compliance tier | All Phase 4 tasks are STANDARD with "Direct test execution" verification | All Phase 4 tasks are EXEMPT with "Skip verification" | High |
| X-003 | Roadmap item R-003 mapping | R-003 ("executor unification hypothesis") maps to T02.03, D-0007 as STRICT | R-003 maps to "TUI/monitor/tmux integration tests" (T01.03) -- a Phase 1 test task | High |
| X-004 | Phase 2 T02.02/T02.03 scope | T02.02 combines hook params + on_exit into one STRICT task; T02.03 combines factory migration + NFR-007 | T02.02 = hook params only; T02.03 = on_exit call only; T02.04 = factories; T02.05 = wiring; T02.06 = NFR-007 | Medium |

## Unique Contributions

| # | Variant | Contribution | Value Assessment |
|---|---------|-------------|-----------------|
| U-001 | OPUS4.6 (B) | Concrete test file names (test_watchdog.py, test_multi_phase.py, test_tui_monitor.py, test_diagnostics.py) with exact case counts and pytest commands | High |
| U-002 | OPUS4.6 (B) | Rollback strategy per task (e.g., "Delete tests/sprint/test_watchdog.py", "git revert") | High |
| U-003 | OPUS4.6 (B) | Mid-phase checkpoint at T02.01-T02.05 before wiring step | Medium |
| U-004 | OPUS4.6 (B) | Explicit grep acceptance criteria (e.g., `grep -n "def wait" src/...` returns 0 results) | High |
| U-005 | OPUS4.6 (B) | Separate NFR-007 verification tasks in both Phase 2 (T02.06) and Phase 4 (T04.05) | Medium |
| U-006 | GPT5.4 (A) | 3-file artifact set per deliverable (spec.md + notes.md + evidence.md) | Low |
| U-007 | GPT5.4 (A) | Roadmap preamble items (R-001 to R-003) capturing strategic context | Low |

## Summary
- Total structural differences: 5
- Total content differences: 12
- Total contradictions: 4
- Total unique contributions: 7
- Highest-severity items: C-001, C-004, C-005, C-007, C-008, C-011, C-012, X-001, X-002, X-003