docs: bump claude-opus-4-6 to claude-opus-4-7 across docs, examples, and AGENTS.md

Syncs the README translations, CONTRIBUTING, docs/reference,
docs/guide, docs/examples JSONC configs, and the hierarchical
src/**/AGENTS.md files with the model version bump already landed
in the source and migration commits.

docs/examples/planning-focused.jsonc

@@ -7,8 +7,8 @@
   "agents": {
     // Orchestrator: delegates to planning agents first
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-6",
-      "ultrawork": { "model": "anthropic/claude-opus-4-6", "variant": "max" },
+      "model": "anthropic/claude-opus-4-7",
+      "ultrawork": { "model": "anthropic/claude-opus-4-7", "variant": "max" },
       "prompt_append": "Always consult prometheus and atlas for planning. Never rush to implementation.",
     },
 
@@ -20,7 +20,7 @@
 
     // Primary planner: deep interview mode
     "prometheus": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-opus-4-7",
       "thinking": { "type": "enabled", "budgetTokens": 160000 },
       "prompt_append": "Interview extensively. Question assumptions. Build exhaustive plans with milestones, risks, and contingencies. Use deep & quick agents heavily in parallel for research.",
     },
@@ -43,7 +43,7 @@
 
     // Plan review and refinement: heavily utilized
     "metis": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-opus-4-7",
       "prompt_append": "Critically evaluate plans. Identify gaps, risks, and improvements. Be thorough.",
     },
 
@@ -98,7 +98,7 @@
       "openai": 3,
     },
     "modelConcurrency": {
-      "anthropic/claude-opus-4-6": 2,
+      "anthropic/claude-opus-4-7": 2,
       "openai/gpt-5.4": 2,
     },
   },