test: harden agent verification workflow

.agents/skills/subminer-change-verification/SKILL.md

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+---
+name: "subminer-change-verification"
+description: "Use when working in the SubMiner repo and you need to verify code changes actually work. Covers targeted regression checks during debugging and pre-handoff verification, with cheap-first lane selection for config, docs, launcher/plugin, runtime-compat, and optional real-runtime escalation."
+---
+
+# SubMiner Change Verification
+
+Use this skill for SubMiner code changes. Default to cheap, repo-native verification first. Escalate only when the changed behavior actually depends on Electron, mpv, overlay/window tracking, or other GUI-sensitive runtime behavior.
+
+## Scripts
+
+- `scripts/classify_subminer_diff.sh`
+  - Emits suggested lanes and flags from explicit paths or current git changes.
+- `scripts/verify_subminer_change.sh`
+  - Runs selected lanes, captures artifacts, and writes a compact summary.
+
+If you need an explicit installed path, use the directory that contains this `SKILL.md`. The helper scripts live under:
+
+```bash
+export SUBMINER_VERIFY_SKILL="<path-to-skill>"
+```
+
+## Default workflow
+
+1. Inspect the changed files or user-requested area.
+2. Run the classifier unless you already know the right lane.
+3. Run the verifier with the cheapest sufficient lane set.
+4. If the classifier emits `flag:real-runtime-candidate`, do not jump straight to runtime verification. First run the non-runtime lanes.
+5. Escalate to explicit `--lane real-runtime --allow-real-runtime` only when cheaper lanes cannot validate the behavior claim.
+6. Return:
+   - verification summary
+   - exact commands run
+   - artifact paths
+   - skipped lanes and blockers
+
+## Quick start
+
+Repo-source quick start:
+
+```bash
+bash .agents/skills/subminer-change-verification/scripts/classify_subminer_diff.sh
+```
+
+Installed-skill quick start:
+
+```bash
+bash "$SUBMINER_VERIFY_SKILL/scripts/classify_subminer_diff.sh"
+```
+
+Classify explicit files:
+
+```bash
+bash .agents/skills/subminer-change-verification/scripts/classify_subminer_diff.sh \
+  launcher/main.ts \
+  plugin/subminer/lifecycle.lua \
+  src/main/runtime/mpv-client-runtime-service.ts
+```
+
+Run automatic lane selection:
+
+```bash
+bash .agents/skills/subminer-change-verification/scripts/verify_subminer_change.sh
+```
+
+Installed-skill form:
+
+```bash
+bash "$SUBMINER_VERIFY_SKILL/scripts/verify_subminer_change.sh"
+```
+
+Run targeted lanes:
+
+```bash
+bash .agents/skills/subminer-change-verification/scripts/verify_subminer_change.sh \
+  --lane launcher-plugin \
+  --lane runtime-compat
+```
+
+Dry-run to inspect planned commands and artifact layout:
+
+```bash
+bash .agents/skills/subminer-change-verification/scripts/verify_subminer_change.sh \
+  --dry-run \
+  launcher/main.ts \
+  src/main.ts
+```
+
+## Lane guidance
+
+- `docs`
+  - For `docs-site/`, `docs/`, and doc-only edits.
+- `config`
+  - For `src/config/` and config-template-sensitive edits.
+- `core`
+  - For general source changes where `typecheck` + `test:fast` is the best cheap signal.
+- `launcher-plugin`
+  - For `launcher/`, `plugin/subminer/`, plugin gating scripts, and wrapper/mpv routing work.
+- `runtime-compat`
+  - For `src/main*`, runtime/composer wiring, mpv/overlay services, window trackers, and dist-sensitive behavior.
+- `real-runtime`
+  - Only after deliberate escalation.
+
+## Real Runtime Escalation
+
+Escalate only when the change claim depends on actual runtime behavior, for example:
+
+- overlay appears, hides, or tracks a real mpv window
+- mpv launch flags or pause-until-ready behavior
+- plugin/socket/auto-start handshake under a real player
+- macOS/window-tracker/focus-sensitive behavior
+
+If the environment cannot support authoritative runtime verification, report the blocker explicitly. Do not silently downgrade a runtime-required claim to a pass.
+
+## Artifact contract
+
+The verifier writes under `.tmp/skill-verification/<timestamp>/`:
+
+- `summary.json`
+- `summary.txt`
+- `classification.txt`
+- `env.txt`
+- `lanes.txt`
+- `steps.tsv`
+- `steps/*.stdout.log`
+- `steps/*.stderr.log`
+
+On failure, quote the exact failing command and point at the artifact directory.