feat(observer): обогащение primary_rationale из router-state (Task 3)

- parseTranscript получает третий параметр options = {}
- options.routerStateBaseDir пробрасывается в readRouterState
- recommended_node: router-state переопределяет classification-map
- новые поля: recommended_chain, chain_progress, chain_completed
- 2 новых теста (enrich + fallback), 538/538 tools GREEN

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tools/observer-transcript-parser.mjs

@@ -18,6 +18,7 @@
 import { readFileSync } from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname, join } from 'node:path';
+import { readRouterState, extractRouterFields } from './observer-state-enricher.mjs';
 import { homedir } from 'node:os';
 import { detectChoiceProvenance, detectAskUserQuestionChoice } from './observer-choice-detector.mjs';
 import { loadChainMap, chainsFor } from './observer-chain-detector.mjs';
@@ -751,13 +752,17 @@ function extractLastAssistantContent(entries, turnStartIdx) {
  * @param {string|null} fallbackSessionId - Used when the transcript has no sessionId.
  * @returns {object} v2 episode.
  */
-export function parseTranscript(transcriptText, fallbackSessionId = null) {
+export function parseTranscript(transcriptText, fallbackSessionId = null, options = {}) {
   const { entries, broken, total } = parseLines(transcriptText);
 
   const withSession = entries.find((e) => e && e.sessionId);
   const sessionId =
     (withSession && withSession.sessionId) || fallbackSessionId || `unknown-${Date.now()}`;
 
+  const routerStateBaseDir = options.routerStateBaseDir;
+  const routerState = readRouterState(sessionId, routerStateBaseDir ? { baseDir: routerStateBaseDir } : {});
+  const routerFields = extractRouterFields(routerState);
+
   const start = findTurnStart(entries);
   const turn = entries.slice(start);
 
@@ -809,6 +814,10 @@ export function parseTranscript(transcriptText, fallbackSessionId = null) {
     primary_rationale: (() => {
       const tag = parseReasoningTag(turn);
       const merge = (heur, fromTag) => [...new Set([...heur, ...fromTag])];
+      const classifMapNode =
+        skills.length === 0
+          ? recommendNode(classifyTask(prompt), getClassificationMap(), getDormancy())
+          : null;
       return {
         step: 1,
         node_chosen: skills.length > 0 ? skills[0] : 'direct',
@@ -820,10 +829,10 @@ export function parseTranscript(transcriptText, fallbackSessionId = null) {
           ? { invoked: true, rules: ['Pravila §12'] }
           : { invoked: false, rules: [] },
         task_classification: classifyTask(prompt),
-        recommended_node:
-          skills.length === 0
-            ? recommendNode(classifyTask(prompt), getClassificationMap(), getDormancy())
-            : null,
+        recommended_node: routerFields.recommended_node !== null ? routerFields.recommended_node : classifMapNode,
+        recommended_chain: routerFields.recommended_chain,
+        chain_progress: routerFields.chain_progress,
+        chain_completed: routerFields.chain_completed,
       };
     })(),
     events,