v1.89.0.0 feat: add shared-code extraction audit (#2925)

* feat: bind shared-code review advice to source and branch

* feat: add shared-code extraction audit and scoped review checks

* test: recognize complete source reads and explicit coverage legends

* chore: bump version and changelog (v1.88.0.0)

Co-Authored-By: OpenAI Codex <noreply@openai.com>

* test: capture native review questions and retain public evidence

Capture the actual first public native question with strict ownership and display matching. Preserve terminal failures and raw evidence, and retain SDK completion checks.

* test: recognize verified review evidence and complete fixtures

Recognize complete source and diagram evidence, concrete design and developer-experience decisions, and the complete planted scenario contracts. Preserve negative controls and grading thresholds.

* fix: preserve decision brief structure in native questions

Keep the required pros-and-cons heading and final Net field in native question text. Regenerate host outputs and document the release and evaluation repairs.

Co-Authored-By: OpenAI Codex <noreply@openai.com>

* docs: update project documentation for v1.88.0.0

Co-Authored-By: OpenAI Codex <noreply@openai.com>

* fix: correct eval retry accounting and ship workflow gates

* fix: capture native eval evidence and stabilize CI fixtures

* fix: keep shared-code eval skips read-only

Choose explicit no-change answers instead of mixed fix/preservation options.
Reuse the bounded revalidation prompt for path fixtures so required review
metadata is available without repeated discovery. Preserve source checks,
retry limits, and failed native terminal outcomes.

Add captured-question and callback regressions, plus evaluation selection
coverage for the affected fixtures.

---------

Co-authored-by: OpenAI Codex <noreply@openai.com>

docs/skills.md

@@ -38,6 +38,7 @@ Detailed guides for every gstack skill — philosophy, workflow, and examples.
 | [`/context-save`](#context-save) | **Save State** | Save working context (git state, decisions, remaining work) so any future session can resume. |
 | [`/context-restore`](#context-restore) | **Restore State** | Resume from a saved context, even across Conductor workspace handoffs. |
 | [`/health`](#health) | **Code Quality Dashboard** | Wraps type checker, linter, tests, dead code detection. Computes a weighted 0-10 score; tracks trends over time. |
+| [`/deslop-shared-libs`](#deslop-shared-libs) | **Shared Code Reviewer** | Find worthwhile shared-code extractions in recent work. Recommendations only. |
 | [`/landing-report`](#landing-report) | **Ship Queue Dashboard** | Read-only snapshot of the workspace-aware ship queue. Which version slots are claimed, which sibling workspaces have WIP. |
 | [`/benchmark-models`](#benchmark-models) | **Model Benchmark** | Side-by-side cross-model benchmark for skills (Claude vs GPT vs Gemini). Latency, tokens, cost, optional LLM-judged quality. |
 | | | |
@@ -740,6 +741,33 @@ Claude: Monitoring 8 pages every 2 minutes...
 
 ---
 
+## `/deslop-shared-libs`
+
+Find shared code worth extracting from recent work. By default, the skill reviews
+the preceding 14 UTC days of commits and PRs, plus relevant current-branch work.
+It checks existing helpers, verifies compatible authored callers, and compares
+up to five new opportunities before recommending up to three. Estimates include
+tests and integration, so moving code into a new file does not count as savings.
+Fewer recommendations, including none, are valid.
+
+```text
+You: /deslop-shared-libs
+You: /deslop-shared-libs — focus on the API and workers over the past 30 days
+```
+
+The report links the reviewed source, names the smallest useful helper and its
+callers, explains reliability gains and shared-failure risks, and separates work
+already covered by PRs. It checks older open PRs for candidate overlap within a
+bounded scan and discloses inaccessible history or incomplete coverage. It reads
+raw uncommitted source without running project hooks or filters. It never edits
+code, runs project tests, saves a report, or creates issues or PRs.
+
+`/plan-eng-review` applies the same criteria to the plan and proposed callers.
+`/review` checks the diff and related callers even on tiny changes. These scoped
+checks do not run the history audit. Optional extractions are advisory and require
+approval; they do not block a clean review or reduce its score. Actual defects
+keep their normal fix handling.
+
 ## `/benchmark`
 
 This is my **performance engineer mode**.