docs: update AGENTS.md knowledge base (043b1a33)

- Add 7 missing hooks, remove deleted background-compaction
- Update line counts (atlas 572, sisyphus 450, config-manager 664)
- Add 18 undocumented shared utilities, remove stale references
- Add task-toast-manager, remove-deadcode command
- Update test count 90→95, add 4 complexity hotspots

src/cli/AGENTS.md

@@ -10,8 +10,9 @@ CLI entry: `bunx oh-my-opencode`. Interactive installer, doctor diagnostics. Com
 cli/
 ├── index.ts              # Commander.js entry
 ├── install.ts            # Interactive TUI (520 lines)
-├── config-manager.ts     # JSONC parsing (641 lines)
+├── config-manager.ts     # JSONC parsing (664 lines)
 ├── types.ts              # InstallArgs, InstallConfig
+├── model-fallback.ts     # Model fallback configuration
 ├── doctor/
 │   ├── index.ts          # Doctor entry
 │   ├── runner.ts         # Check orchestration
@@ -25,6 +26,7 @@ cli/
 │       ├── dependencies.ts # AST-Grep, Comment Checker
 │       ├── lsp.ts        # LSP connectivity
 │       ├── mcp.ts        # MCP validation
+│       ├── model-resolution.ts # Model resolution check
 │       └── gh.ts         # GitHub CLI
 ├── run/
 │   └── index.ts          # Session launcher