docs: add evaluator harness config scenario

docs/ECC-2.0-GA-ROADMAP.md

@@ -58,8 +58,8 @@ As of 2026-05-12:
   `examples/evaluator-rag-prototype/` define the first read-only
   self-improving harness prototype: scenario specs, traces, reports,
   candidate playbooks, verifier results, accepted maintainer-salvage,
-  billing-readiness, and CI-failure-diagnosis candidates, plus rejected
-  unsafe candidates.
+  billing-readiness, CI-failure-diagnosis, and harness-config-quality
+  candidates, plus rejected unsafe candidates.
 - The npm package surface now excludes Python bytecode/cache artifacts through
   package `files` negation rules and a publish-surface regression test.
 - `docs/legacy-artifact-inventory.md` records that no `_legacy-documents-*`
@@ -200,7 +200,7 @@ is not complete unless the evidence column exists and has been freshly verified.
 | AgentShield enterprise iteration | Policy gates, SARIF, packs, provenance, corpus, HTML reports, exception lifecycle audit | PRs #53, #55-#62 landed with test evidence | Needs PDF/export decision or next enterprise signal |
 | ECC Tools next-level app | Billing audit, PR checks, deep analyzer, sync backlog | PRs #26-#39 landed with test evidence | Needs capacity-backed Linear rollout / broader evaluator corpus |
 | GitGuardian/Dependabot/CodeRabbit-style checks | Non-blocking taxonomy and deterministic follow-up checks | ECC-Tools risk taxonomy check plus follow-up signals landed, including Skill Quality, Deep Analyzer Evidence, Analyzer Corpus Evidence, RAG/Evaluator Evidence, and PR Review/Salvage Evidence | Partially complete |
-| Harness-agnostic learning system | Audit, adapter matrix, observability, traces, promotion loop | Audit/adapters/observability gates plus `docs/architecture/evaluator-rag-prototype.md` and `examples/evaluator-rag-prototype/` define read-only stale-salvage, billing-readiness, and CI-failure-diagnosis scenarios with trace, report, playbook, and verifier result artifacts | Needs broader evaluator corpus |
+| Harness-agnostic learning system | Audit, adapter matrix, observability, traces, promotion loop | Audit/adapters/observability gates plus `docs/architecture/evaluator-rag-prototype.md` and `examples/evaluator-rag-prototype/` define read-only stale-salvage, billing-readiness, CI-failure-diagnosis, and harness-config-quality scenarios with trace, report, playbook, and verifier result artifacts | Needs AgentShield policy exception corpus |
 | Linear roadmap is detailed | Linear project status plus repo mirror | Repo mirror exists; issue creation was retried on 2026-05-12 and remains blocked by the workspace free issue limit | Needs recurring status updates after each merge batch |
 | Flow separation and progress tracking | Flow lanes with owner artifacts and update cadence | This roadmap defines lanes below | Active |
 | Realtime Linear sync | Project updates while issue limit is blocked; issues later | ECC-Tools #39 implements opt-in Linear API sync for deferred follow-up backlog items | Needs workspace capacity/config rollout |
@@ -219,7 +219,7 @@ back to the repo evidence and merge commits.
 | Queue hygiene and salvage | GitHub PR/issue state, salvage ledger | Append ledger entries for any future stale closures | Every cleanup batch |
 | Release and publication | rc.1 release docs, publication readiness doc | Naming matrix and plugin submission/contact checklist | Before any tag |
 | Harness OS core | Audit, adapter matrix, observability docs, `ecc2/` | HUD/session-control acceptance spec | Weekly until GA |
-| Evaluation and RAG | Reference-set validation, harness audit, traces | Read-only evaluator/RAG prototype plus stale-salvage and billing-readiness fixtures | Expand to CI, harness-config, and AgentShield scenarios |
+| Evaluation and RAG | Reference-set validation, harness audit, traces | Read-only evaluator/RAG prototype plus stale-salvage, billing-readiness, CI-failure-diagnosis, and harness-config-quality fixtures | Expand to AgentShield policy exception scenario |
 | AgentShield enterprise | AgentShield PR evidence and roadmap notes | PDF-export decision or next enterprise signal | After value decision |
 | ECC Tools app | ECC-Tools PR evidence, billing audit, risk taxonomy | Capacity-backed Linear rollout or broader evaluator/RAG corpus slice | Next implementation batch |
 | Linear progress | Linear project status updates and this mirror | Status update with queue/evidence/missing gates | Every significant merge batch |

docs/architecture/evaluator-rag-prototype.md

@@ -12,7 +12,9 @@ lane has real inputs, real accepted work, and real rejected work. The corpus now
 also includes a billing/Marketplace readiness scenario so launch copy cannot
 treat dry-run release evidence or roadmap intent as live billing state. A
 CI-failure diagnosis scenario adds the log-first workflow needed before an
-agent proposes fixes for red checks.
+agent proposes fixes for red checks. A harness-config quality scenario keeps
+MCP, plugin, hook, command, agent, and adapter recommendations tied to the
+adapter matrix before they mutate setup guidance.
 
 ## Reference Pressure
 
@@ -100,6 +102,9 @@ Current corpus:
   launch claims before public copy says they are live.
 - `ci-failure-diagnosis`: requires failed-job logs, changed-file scope, and a
   named regression command before a CI fix playbook can be promoted.
+- `harness-config-quality`: requires adapter state, install/onramp path,
+  verification commands, risk notes, and config-preservation behavior before a
+  harness setup recommendation can be promoted.
 
 ## ECC Tools Mapping
 
@@ -133,5 +138,4 @@ A candidate can be promoted only when:
 
 The next evaluator/RAG corpus should add:
 
-- a harness-config quality scenario covering MCP/plugin/hook drift;
 - an AgentShield policy exception scenario with SARIF and report evidence.