chore: update model references to Claude 4.6 and GPT-5.2

- Claude Opus 4.5 → Opus 4.6, Claude Sonnet 4.5 → Sonnet 4.6 (Haiku stays 4.5)
- Update claude-sonnet-4-5 model IDs to claude-sonnet-4-6 in code examples
- Update SWE-bench stat from 80.9% to 80.8% for Opus 4.6
- Update GPT refs: GPT-5 → GPT-5.2, GPT-4o → gpt-5.2, GPT-4o-mini → GPT-5-mini
- Fix GPT-5.2-mini → GPT-5-mini (correct model name per OpenAI)
- Bump marketplace to v1.5.2 and affected plugin versions

plugins/agent-orchestration/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "agent-orchestration",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "Multi-agent system optimization, agent improvement workflows, and context management",
   "author": {
     "name": "Seth Hobson",

plugins/agent-orchestration/commands/multi-agent-optimize.md

@@ -146,7 +146,7 @@ class CostOptimizer:
         self.token_budget = 100000  # Monthly budget
         self.token_usage = 0
         self.model_costs = {
-            'gpt-5': 0.03,
+            'gpt-5.2': 0.03,
             'claude-4-sonnet': 0.015,
             'claude-4-haiku': 0.0025
         }