router: set ResolvedBy at each function selection point

Assign provenance where the exact fn is produced:
- grammar_fixed: praxis/task-status grammars hardcode fn
- grammar_matcher: wakeword-act grammar invokes ActMatcher
- extractor_raw: Extractor.Extract matches over raw utterance
- extractor_llm_text: fillSlots LLM backfill matches cleaned text
- fallback_matcher: ResolveActionCandidate runs the fallback matcher

ResolveActionCandidate propagates Slots.ResolvedBy into
ActionCandidate.ResolvedBy. No selection behavior changes.

internal/router/actioncandidate.go

@@ -22,6 +22,11 @@ type ActionCandidate struct {
 	// here. Carried for observability; not used for dispatch.
 	Producer RouteProducer
 
+	// ResolvedBy — which component actually selected the exact function.
+	// Carried from the routing decision's Slots.ResolvedBy. Five disjoint
+	// values; empty when no function was resolved.
+	ResolvedBy ActionResolutionMethod
+
 	// Confidence — the routing confidence from the decision. Carried for
 	// observability; not used for dispatch.
 	Confidence float64
@@ -146,6 +151,7 @@ func ResolveActionCandidate(dec Decision, m ActMatcher) ActionCandidate {
 			Args:       dec.Slots.Args,
 			Source:     ActionSourceRoute,
 			Producer:   dec.Producer,
+			ResolvedBy: dec.Slots.ResolvedBy,
 			Confidence: dec.Confidence,
 		}
 	}
@@ -158,6 +164,7 @@ func ResolveActionCandidate(dec Decision, m ActMatcher) ActionCandidate {
 				Args:       args,
 				Source:     ActionSourceMatcher,
 				Producer:   dec.Producer,
+				ResolvedBy: ActionResolutionFallbackMatcher,
 				Confidence: dec.Confidence,
 			}
 		}

internal/router/praxis.go

@@ -214,7 +214,7 @@ func PraxisGrammars() []Grammar {
 				Stage:      0,
 				Intent:     IntentAct,
 				Confidence: 1.0,
-					Slots:      Slots{Fn: c.Fn, HasFn: true, Value: c.Ref},
+				Slots:      Slots{Fn: c.Fn, HasFn: true, Value: c.Ref, ResolvedBy: ActionResolutionGrammarFixed},
 			}, true
 			},
 		},
@@ -226,7 +226,7 @@ func PraxisGrammars() []Grammar {
 					Stage:      0,
 					Intent:     IntentAct,
 					Confidence: 1.0,
-					Slots:      Slots{Fn: "list_attention", HasFn: true},
+					Slots:      Slots{Fn: "list_attention", HasFn: true, ResolvedBy: ActionResolutionGrammarFixed},
 				}, true
 			},
 		},
@@ -238,7 +238,7 @@ func PraxisGrammars() []Grammar {
 					Stage:      0,
 					Intent:     IntentAct,
 					Confidence: 1.0,
-					Slots:      Slots{Fn: "list_changes", HasFn: true},
+					Slots:      Slots{Fn: "list_changes", HasFn: true, ResolvedBy: ActionResolutionGrammarFixed},
 				}, true
 			},
 		},
@@ -261,7 +261,7 @@ func PraxisGrammars() []Grammar {
 					// Text, not Value: entityAttentionCapability reads Value
 					// first and that slot means an item id everywhere else in
 					// the Praxis dispatch.
-					Slots: Slots{Fn: "entity_attention", HasFn: true, Text: subject},
+					Slots: Slots{Fn: "entity_attention", HasFn: true, Text: subject, ResolvedBy: ActionResolutionGrammarFixed},
 				}, true
 			},
 		},
@@ -284,7 +284,7 @@ func praxisServiceAttentionDecision(utterance string) (Decision, bool) {
 		Stage:      0,
 		Intent:     IntentAct,
 		Confidence: 1,
-		Slots:      Slots{Fn: "entity_attention", HasFn: true, Text: tokens[3]},
+		Slots:      Slots{Fn: "entity_attention", HasFn: true, Text: tokens[3], ResolvedBy: ActionResolutionGrammarFixed},
 	}, true
 }
 

internal/router/router.go

@@ -303,7 +303,7 @@ func (r *Router) fillMatchedSlots(ctx context.Context, d *Decision, now time.Tim
 		d.Slots.Key, d.Slots.Value, d.Slots.HasKey = ex.Key, ex.Value, ex.HasKey
 	}
 	if !d.Slots.HasFn && ex.HasFn {
-		d.Slots.Fn, d.Slots.Args, d.Slots.HasFn = ex.Fn, ex.Args, ex.HasFn
+		d.Slots.Fn, d.Slots.Args, d.Slots.HasFn, d.Slots.ResolvedBy = ex.Fn, ex.Args, ex.HasFn, ex.ResolvedBy
 	}
 	return ex
 }
@@ -320,6 +320,7 @@ func (r *Router) fillSlots(ctx context.Context, d *Decision, now time.Time) {
 		d.Slots.Text != "" && d.Slots.Text != d.Utterance {
 		if fn, args, ok := r.extractor.Acts.Match(d.Slots.Text); ok {
 			d.Slots.Fn, d.Slots.Args, d.Slots.HasFn = fn, args, true
+			d.Slots.ResolvedBy = ActionResolutionExtractorLLMText
 		}
 	}
 	// The extractor's Text is the raw utterance, which is the payload for a

internal/router/slots.go

@@ -73,6 +73,7 @@ func (e Extractor) Extract(ctx context.Context, intent Intent, utterance string,
 				s.Fn = fn
 				s.Args = args
 				s.HasFn = true
+				s.ResolvedBy = ActionResolutionExtractorRaw
 			}
 		}
 	case IntentFact:

internal/router/stage0.go

@@ -99,7 +99,7 @@ func DefaultGrammars(actMatcher ActMatcher) []Grammar {
 				Stage:      0,
 				Intent:     IntentAct,
 				Confidence: 1.0,
-					Slots:      Slots{Fn: fn, Args: args, HasFn: true, Text: rest},
+				Slots:      Slots{Fn: fn, Args: args, HasFn: true, Text: rest, ResolvedBy: ActionResolutionGrammarMatcher},
 			}, true
 			},
 		},

internal/router/taskstatus.go

@@ -389,7 +389,7 @@ func TaskStatusGrammar() Grammar {
 				// which is the pairing handlePraxisAct uses for an item and its
 				// reference. Empty Text is a claim, not a refusal: the daemon
 				// asks which task, having the list she does not.
-				Slots: Slots{Fn: TaskStatusFn, HasFn: true, Value: c.Status, Text: c.Text},
+				Slots: Slots{Fn: TaskStatusFn, HasFn: true, Value: c.Status, Text: c.Text, ResolvedBy: ActionResolutionGrammarFixed},
 			}, true
 		},
 	}