mavend: wire resolveAction into actionAct

Daemon half of the action-resolution boundary:

- Add resolveAction wrapper: delegates to ResolveActionCandidate,
  records outcome in the decision trace (action-resolve:route/matcher)
- Refactor actionAct: remove matcher call, consume candidate, write
  resolved values back into Slots for downstream branches
- Add 8 integration tests pinning all required scenarios:
  route-sourced, matcher-sourced, matcher miss, destructive confirm,
  task-status intercept, stage-0, learned-router, alias match

All existing tests pass. Execution/risk/confirmation unchanged.

cmd/mavend/actionresolve.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"context"
+
+	"github.com/kami/maven/internal/decision"
+	"github.com/kami/maven/internal/router"
+)
+
+// resolveAction produces an ActionCandidate from a routing decision. It is the
+// single boundary between routing and action execution: everything downstream
+// (refusesCommand, task-status, Praxis, Hexis, proposeGap, tool.Executor.Exec)
+// consumes the candidate rather than re-resolving the function.
+//
+// Delegates to router.ResolveActionCandidate for the resolution logic, then
+// records the outcome in the decision trace.
+func (h *reactiveHandler) resolveAction(ctx context.Context, dec router.Decision) router.ActionCandidate {
+	candidate := router.ResolveActionCandidate(dec, h.matcher)
+
+	// Record the resolution outcome in the decision trace.
+	if dec.Intent == router.IntentAct {
+		if candidate.ActionResolved() {
+			noteActionResolution(ctx, string(candidate.Source), candidate.Fn, true)
+		} else {
+			noteActionResolution(ctx, "matcher", "", false)
+		}
+	}
+
+	return candidate
+}
+
+// noteActionResolution records the action resolution outcome in the decision
+// trace. A nil recorder is the normal case in tests.
+func noteActionResolution(ctx context.Context, source, fn string, resolved bool) {
+	rec := decision.From(ctx)
+	if rec == nil {
+		return
+	}
+	outcome := decision.Declined
+	reason := "no match"
+	if resolved {
+		outcome = decision.Won
+		reason = "resolved via " + source
+		if fn != "" {
+			reason += ": " + fn
+		}
+	}
+	rec.Note(decision.Claim{
+		Stage:    decision.StageAction,
+		Claimant: "action-resolve",
+		Outcome:  outcome,
+		Reason:   reason,
+	})
+}