fix: address Codex review from PR #148 (3 P1 + 1 P2)

- Fix PromptRouter regex: \s not s for whitespace splitting
- Fix ReactiveCompaction: downgrade least-relevant half, not most-relevant
- Fix reactivePackerWrapper: truncate content after depth adjustment
- Fix agentSearchIntegration: include metadata in cache key for freshness

Author: VictorGjn

src/context/PromptRouter.ts

@@ -30,8 +30,8 @@ export function tokenizePrompt(prompt: string): Set<string> {
   return new Set(
     prompt
       .toLowerCase()
-      .replace(/[^a-z0-9s/_-]/g, '')
-      .split(/[s/_-]+/)
+      .replace(/[^a-z0-9\s\/_-]/g, '')
+      .split(/[\s\/_-]+/)
       .filter(t => t.length >= 2)
   );
 }

src/context/ReactiveCompaction.ts

@@ -68,9 +68,9 @@ export class ReactiveCompaction {
               }
             }
           } else if (signal.ratio >= this.config.pressureThreshold) {
-            // Pressure: downgrade bottom half by one level
+            // Pressure: downgrade least-relevant half by one level
             const half = Math.ceil(sorted.length / 2);
-            for (let i = half; i < sorted.length; i++) {
+            for (let i = 0; i < half; i++) {
               const f = sorted[i];
               const next = this.nextDepth(f.depth);
               if (next) adjustments.push({ fileId: f.fileId, currentDepth: f.depth, newDepth: next, reason: 'token_pressure' });

src/graph/reactivePackerWrapper.ts

@@ -127,7 +127,14 @@ export function withReactiveCompaction(
       const baseTokens = oldRatio > 0 ? item.tokens / oldRatio : item.tokens;
       const newTokens = Math.max(1, Math.ceil(baseTokens * newRatio));
       newTotal += newTokens;
-      return { ...item, depth: newDepthNumeric, tokens: newTokens };
+      // Truncate content proportionally to new depth
+      const contentStr = typeof item.content === 'string' ? item.content : '';
+      const truncatedLength = oldRatio > 0 ? Math.ceil(contentStr.length * (newRatio / oldRatio)) : contentStr.length;
+      const truncatedContent = contentStr.length > truncatedLength
+        ? contentStr.slice(0, truncatedLength) + '
+[... truncated by reactive compaction]'
+        : contentStr;
+      return { ...item, depth: newDepthNumeric, tokens: newTokens, content: truncatedContent };
     }
     newTotal += item.tokens;
     return item;

src/services/agentSearchIntegration.ts

@@ -43,7 +43,7 @@ export function createAgentSearchService(
   agents: AgentConfig[],
   knowledge: KnowledgeSource[] = [],
 ): AgentSearchService {
-  const hash = JSON.stringify(agents.map(a => a.id).sort());
+  const hash = JSON.stringify(agents.map(a => [a.id, a.description, a.role, ...(a.tags ?? [])].join('|')).sort());
   if (!_searchInstance || hash !== _lastIndexHash) {
     _searchInstance = new AgentSearch(agents, knowledge);
     _lastIndexHash = hash;