Add gitea-merge.sh for complete merge workflow

- Creates gitea-merge.sh: rebase merge, delete branch, close PR
- Updates CLAUDE.md: simplified git workflow using new script
- Adds model selection reminder to general-instructions.json
- Documents Gitea API commands in CLAUDE.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

state/personal-assistant/general-instructions.json

@@ -8,6 +8,12 @@
       "status": "active",
       "added": "2025-01-21"
     },
+    {
+      "id": "d4e5f6a7-8901-23de-f012-444444444444",
+      "instruction": "Use appropriate model for task: Haiku for simple extraction/formatting, Sonnet for code review/analysis, Opus for complex reasoning. Delegate to subagents with correct model.",
+      "status": "active",
+      "added": "2026-01-04"
+    },
     {
       "id": "b2c3d4e5-6789-01bc-def0-222222222222",
       "instruction": "Git workflow: See CLAUDE.md for full process. Use rebase merges, not merge commits.",