# /architecture-review — Phase 8: Write and Update Traceability Index

> Part of `/architecture-review`. `SKILL.md` names when to read this file; the settings it
> resolved and the rules under its later headings still apply here.

## Phase 8: Write and Update Traceability Index

**In this file:**

- RTM Output (rtm mode only)
- TR Registry Update
- Reflexion Log Update
- Session State Update

Use `AskUserQuestion` for the write approval:
- "Review complete. What would you like to write?"
  - [A] Write all three files — review report (`docs/architecture/architecture-review-[date].md`), traceability index (`docs/architecture/requirements-traceability.md`), TR registry (`docs/architecture/tr-registry.yaml`)
  - [B] Write review report only — `docs/architecture/architecture-review-[date].md`
  - [C] Don't write anything yet — I need to review the findings first

When Phase 4 found a 🔴 conflict and `docs/consistency-failures.md` exists, name
that file in option [A] as well — "…and append [N] conflict entr(y/ies) to
`docs/consistency-failures.md`". Only [A] appends there (see Reflexion Log
Update); [B] writes the report and nothing else.

### RTM Output (rtm mode only)

For `rtm` mode, use `AskUserQuestion`:
- "May I write the full Requirements Traceability Matrix?"
  - [A] Yes — write to `docs/architecture/requirements-traceability.md`
  - [B] Not yet — show me the full RTM data first, then ask again

RTM file format:

```markdown
# Requirements Traceability Matrix (RTM)

> Last Updated: [date]
> Mode: /architecture-review rtm
> Coverage: [N]% full chain complete (GDD → ADR → Story → Test)

## How to read this matrix

| Column | Meaning |
|--------|---------|
| TR-ID | Stable requirement ID from tr-registry.yaml |
| GDD | Source design document |
| ADR | Architectural decision governing implementation |
| Story | Story file that implements this requirement |
| Test File | Automated test file path |
| Test Status | COVERED / MISSING / NONE / NO STORY |

## Full Traceability Matrix

| TR-ID | GDD | Requirement | ADR | Story | Test File | Status |
|-------|-----|-------------|-----|-------|-----------|--------|
[Full matrix rows from Phase 3b]

## Coverage Summary

| Status | Count | % |
|--------|-------|---|
| COVERED — full chain complete | [N] | [%] |
| MISSING test — story exists, no test | [N] | [%] |
| NO STORY — ADR exists, not yet implemented | [N] | [%] |
| NO ADR — architectural gap | [N] | [%] |
| **Total requirements** | **[N]** | **100%** |

## Uncovered Requirements (Priority Fix List)

Requirements where the full chain is broken, prioritised by layer:

### Foundation layer gaps
[list with suggested action per gap]

### Core layer gaps
[list]

### Feature / Presentation layer gaps
[list — lower priority]

## History

| Date | Full Chain % | Notes |
|------|-------------|-------|
| [date] | [%] | Initial RTM |
```

### TR Registry Update

Also ask: "May I update `docs/architecture/tr-registry.yaml` with new requirement
IDs from this review?"

If yes, read the current `docs/architecture/tr-registry.yaml` again first:
the review read it at the start, and another skill or session may have changed
it since. Build the update from that fresh read, never from the earlier copy,
and keep every entry already in it. Then:
- **Append** any new TR-IDs that weren't in the registry before this review
- **Update** `requirement` text and `revised` date for any entries whose GDD
  wording changed (ID stays the same)
- **Mark** `status: deprecated` for any registry entries whose GDD requirement
  no longer exists (confirm with user before marking deprecated)
- **Mark** `status: "superseded-by: TR-[system]-NNN"` for an entry whose
  requirement was split or replaced, naming the new TR-ID(s). Keep the quotes:
  unquoted, the second colon makes the file invalid YAML
- **Never** renumber or delete existing entries
- Update the `last_updated` and `version` fields at the top

This ensures all future story files can reference stable TR-IDs that persist
across every subsequent architecture review.

### Reflexion Log Update

When the user chose Phase 8's [A] — the option that named this file — append
any 🔴 CONFLICT entries found in Phase 4 to `docs/consistency-failures.md` (if
the file exists), after writing the review report:

```markdown
### [YYYY-MM-DD] — /architecture-review — 🔴 CONFLICT
**Domain**: Architecture / [specific domain e.g. State Ownership, Performance]
**Documents involved**: [ADR-NNNN] vs [ADR-MMMM]
**What happened**: [specific conflict — what each ADR claims]
**Resolution**: [how it was or should be resolved]
**Pattern**: [generalised lesson for future ADR authors in this domain]
```

Only append CONFLICT entries — do not log GAP entries (missing ADRs are expected
before the architecture is complete). Do not create the file if missing — only
append when it already exists.

### Session State Update

After writing all approved files, silently append to
`production/session-state/active.md`:

    ## Session Extract — /architecture-review [date]
    - Verdict: [PASS / NOT ASSESSED / CONCERNS / FAIL]
    - Requirements: [N] total — [X] covered, [Y] partial, [Z] gaps
    - New TR-IDs registered: [N, or "None"]
    - GDD revision flags: [comma-separated GDD names, or "None"]
    - Top ADR gaps: [top 3 gap titles from the report, or "None"]
    - Report: docs/architecture/architecture-review-[date].md

If `active.md` does not exist, create it with this block as the initial content.
Confirm in conversation: "Session state updated."

The traceability index — written to `docs/architecture/requirements-traceability.md`,
the path `/propagate-design-change` and the Pre-Production gate read; `rtm` mode
later extends the same file with story and test columns — uses this format:

```markdown
# Architecture Traceability Index
Last Updated: [date]
Engine: [name + version]

## Coverage Summary
- Total requirements: [N]
- Covered: [X] ([%])
- Partial: [Y]
- Gaps: [Z]

## Full Matrix
[Complete traceability matrix from Phase 3]

## Known Gaps
[All ❌ items with suggested ADRs]

## Superseded Requirements
[Requirements whose GDD was changed after the ADR was written]
```

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