refactor(issue): unify solution ID format to SOL-{issue-id}-{seq}

- Update solution-schema.json pattern to support new format
- Add Solution ID Format specification to plan.md
- Fix JSON parsing with extractJsonFromMarkdown + try-catch
- Update all examples in agent and prompt files:
  - issue-plan-agent.md
  - issue-queue-agent.md
  - issue-execute.md
  - issue-queue.md
  - queue.md

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/workflows/cli-templates/schemas/solution-schema.json

@@ -7,8 +7,9 @@
   "properties": {
     "id": {
       "type": "string",
-      "description": "Unique solution identifier",
-      "pattern": "^SOL-[0-9]+$"
+      "description": "Unique solution identifier: SOL-{issue-id}-{seq}",
+      "pattern": "^SOL-.+-[0-9]+$",
+      "examples": ["SOL-GH-123-1", "SOL-ISS-20251229-1"]
     },
     "description": {
       "type": "string",