feat: enhance parser feedback mechanism for improved user guidance

Co-authored-by: Copilot <copilot@github.com>

charactergarden/app/src/app.ts

@@ -17,6 +17,7 @@ export interface AppStateSnapshot {
 export interface TurnResult {
   narration: string;
   parser: "fallback";
+  parser_feedback?: string;
   actions: Action[];
   accepted: Action[];
   rejected: { action: Action; reason: string }[];
@@ -152,10 +153,15 @@ function narrateResult(
   worldState: WorldState,
   accepted: Action[],
   rejected: { action: Action; reason: string }[],
-  latentReason?: string
+  latentReason?: string,
+  parserFeedback?: string
 ): string {
   const lines: string[] = [];
 
+  if (parserFeedback) {
+    lines.push(parserFeedback);
+  }
+
   if (latentReason) {
     lines.push(latentReason);
   }
@@ -212,7 +218,7 @@ export function createCharacterGardenApp(dbPath: string): CharacterGardenApp {
 
   function processTurn(input: string): TurnResult {
     const turnNumber = db.listTurns().length + 1;
-    const { actions, parser } = extractActionsFromProse(input);
+    const { actions, parser, parser_feedback: parserFeedback } = extractActionsFromProse(input);
 
     let activeWorldState = worldState;
     let latentResolution: TurnResult["latent_resolution"];
@@ -260,7 +266,13 @@ export function createCharacterGardenApp(dbPath: string): CharacterGardenApp {
 
     const validation = validate(normalizedActions, activeWorldState);
     const nextWorldState = applyChanges(activeWorldState, validation.state_changes);
-    const narration = narrateResult(nextWorldState, validation.accepted, validation.rejected, latentResolution?.reason);
+    const narration = narrateResult(
+      nextWorldState,
+      validation.accepted,
+      validation.rejected,
+      latentResolution?.reason,
+      parserFeedback
+    );
 
     const turnRecord: Turn = {
       id: randomUUID(),
@@ -300,6 +312,7 @@ export function createCharacterGardenApp(dbPath: string): CharacterGardenApp {
     return {
       narration,
       parser,
+      parser_feedback: parserFeedback,
       actions: normalizedActions,
       accepted: validation.accepted,
       rejected: validation.rejected,