fix(profile): preserve harness across matrix expansion

.evolve/skill-runs.jsonl

@@ -37,3 +37,5 @@
 {"skill":"/critical-audit","ts":"2026-07-29T22:47:03Z","project":"agent-eval-control-integrity","target":"agent-eval PR 487 control-integrity repair, 17 changed paths","operatorPrompt":"","durationMin":null,"verdict":"APPROVE","dispatchedTo":"/verify","operatorOverride":null,"transcriptPath":null,"traceDir":null}
 {"skill":"/verify","ts":"2026-07-29T22:47:04Z","project":"agent-eval-control-integrity","target":"agent-eval PR 487: 4244 tests, build, packed exports, runtime import","operatorPrompt":"","durationMin":null,"verdict":"PASS","dispatchedTo":"/stop","operatorOverride":null,"transcriptPath":null,"traceDir":null}
 {"skill":"/simplify","ts":"2026-07-29T22:54:49Z","project":"agent-eval-control-integrity","target":"PR 487 supervisor-run integrity modularization","operatorPrompt":"","durationMin":null,"verdict":"PASS","dispatchedTo":"/stop","operatorOverride":null,"transcriptPath":null,"traceDir":null}
+{"skill":"/agent-eval","ts":"2026-07-30T11:43:12Z","project":"agent-eval-profile-axis","target":"expandProfileAxes canonical harness propagation","operatorPrompt":"","durationMin":null,"verdict":"PASS","dispatchedTo":"/verify","operatorOverride":null,"transcriptPath":null,"traceDir":null}
+{"skill":"/verify","ts":"2026-07-30T11:43:12Z","project":"agent-eval-profile-axis","target":"agent-eval expandProfileAxes harness source fix","operatorPrompt":"","durationMin":null,"verdict":"PASS","dispatchedTo":"/stop","operatorOverride":null,"transcriptPath":null,"traceDir":null}

src/agent-profile.test.ts

@@ -263,6 +263,21 @@ describe('expandProfileAxes', () => {
     expect(harnessAxisOf(p as AgentProfile)).toEqual({ harness: 'opencode', model: 'm1' })
   })
 
+  it('writes the selected harness onto each canonical profile and overrides the base harness', () => {
+    const baseWithHarness: AgentProfile = { ...axisBase, harness: 'claude-code' }
+    const profiles = expandProfileAxes({
+      base: baseWithHarness,
+      harnesses: ['opencode', 'codex'],
+      models: ['m1'],
+    })
+
+    expect(profiles.map((profile) => profile.harness)).toEqual(['opencode', 'codex'])
+    for (const profile of profiles) {
+      expect(profile.harness).toBe(harnessAxisOf(profile)?.harness)
+    }
+    expect(baseWithHarness.harness).toBe('claude-code')
+  })
+
   it('fails loud on no harnesses / no models — but snaps (never throws) on all-incompatible', () => {
     expect(() => expandProfileAxes({ base: axisBase, harnesses: [] })).toThrow(/no harnesses/)
     expect(() => expandProfileAxes({ base: { name: 'x' } })).toThrow(/no models/)

src/agent-profile.ts

@@ -51,12 +51,13 @@ export const HARNESS_NATIVE_MODEL = 'default'
  * or column→profile mapping (the pattern that let those copies drift and silently
  * break the harness pivot).
  *
- * Each cell clones `base`, sets `model.default`, and stamps `metadata.harness` +
- * `metadata.harnessModel` (both hash-bearing, so every cell gets a distinct
- * `agentProfileId` row and results join back by harness/model via {@link harnessAxisOf}
- * with no hand-recomputed key). A vendor-locked harness snaps to its family's swept
- * models — or its native default ({@link HARNESS_NATIVE_MODEL}) when it supports none —
- * so every requested harness runs; `keepIncompatible` forces every pair verbatim.
+ * Each cell clones `base`, sets the canonical top-level `harness` and `model.default`,
+ * and stamps `metadata.harness` + `metadata.harnessModel` for matrix grouping. Both
+ * metadata fields are hash-bearing, so every cell gets a distinct `agentProfileId` row
+ * and results join back by harness/model via {@link harnessAxisOf} with no
+ * hand-recomputed key. A vendor-locked harness snaps to its family's swept models — or
+ * its native default ({@link HARNESS_NATIVE_MODEL}) when it supports none — so every
+ * requested harness runs; `keepIncompatible` forces every pair verbatim.
  *
  * Omit `harnesses`/`models` to sweep the full default set — the "turn it on for
  * everything we care about" switch, identical in shape whether one harness or all.
@@ -89,6 +90,7 @@ export function expandProfileAxes(spec: ProfileAxisSpec): AgentProfile[] {
     for (const model of effective) {
       const profile: AgentProfile = {
         ...spec.base,
+        harness,
         name: `${spec.base.name ?? 'agent'}/${harness}/${model}`,
         model: { ...spec.base.model, default: model },
         metadata: { ...(spec.base.metadata ?? {}), harness, harnessModel: model },

tests/campaign/run-profile-matrix.test.ts

@@ -378,11 +378,22 @@ describe('runProfileMatrix', () => {
       models: ['test-model@2025-01-01'],
     })
     expect(profiles).toHaveLength(2)
+    expect(profiles.map((profile) => profile.harness)).toEqual(['opencode', 'codex'])
 
-    const result = await runProfileMatrix({ ...baseOpts(), profiles, dispatch: realDispatch })
+    const dispatchedHarnesses = new Set<AgentProfile['harness']>()
+    const dispatch: ProfileDispatchFn<FakeScenario, FakeArtifact> = async (
+      profile,
+      scenario,
+      ctx,
+    ) => {
+      dispatchedHarnesses.add(profile.harness)
+      return realDispatch(profile, scenario, ctx)
+    }
+    const result = await runProfileMatrix({ ...baseOpts(), profiles, dispatch })
 
     // Every record carries the canonical cell, and its harness is the one the
     // generator stamped — no metadata smuggling, no hand-recomputed key.
+    expect(dispatchedHarnesses).toEqual(new Set(['opencode', 'codex']))
     for (const rec of result.records) {
       expect(rec.agentProfile?.harness?.id).toMatch(/^(opencode|codex)$/)
     }