docs: update project documentation for GStack Browser improvements

README.md: updated Real browser mode and sidebar agent sections with
model routing, cookie import button, no idle timeout in headed mode.
Updated skill table entries for /browse and /open-gstack-browser.

docs/skills.md: updated /open-gstack-browser deep dive with model
routing and cookie import details.

GSTACK_BROWSER_V0.md: added 6 new SHIPPED items to implementation
status table (model routing, debug logging, idle timeout, cookie
button, arrow hint, architecture doc).

TODOS.md: marked "Sidebar agent Write tool + error visibility" as
SHIPPED. Added new P2 TODO for direct API calls to eliminate
claude -p startup tax.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/designs/GSTACK_BROWSER_V0.md

@@ -319,8 +319,14 @@ From DESIGN.md:
 | DMG packaging | **SHIPPED** | 189MB compressed |
 | `GSTACK_CHROMIUM_PATH` | **SHIPPED** | Custom Chromium binary support |
 | `BROWSE_EXTENSIONS_DIR` | **SHIPPED** | Extension path override |
-| Auth via `/health` | **SHIPPED** | Replaces .auth.json file approach |
+| Auth via `/health` | **SHIPPED** | Replaces .auth.json file approach, auto-refreshes on server restart |
 | Build script | **SHIPPED** | `scripts/build-app.sh` |
+| Model routing | **SHIPPED** | Sonnet for actions, Opus for analysis (`pickSidebarModel`) |
+| Debug logging | **SHIPPED** | 40+ silent catches → prefixed console logging across 4 files |
+| No idle timeout (headed) | **SHIPPED** | Browser stays alive as long as window is open |
+| Cookie import button | **SHIPPED** | One-click in sidebar footer, opens `/cookie-picker` |
+| Sidebar arrow hint | **SHIPPED** | Points to sidebar, hides only when sidebar actually opens |
+| Architecture doc | **SHIPPED** | `docs/designs/SIDEBAR_MESSAGE_FLOW.md` |
 | Command palette | Planned | Phase 1b |
 | Quick screenshot | Planned | Phase 1b |
 | Status bar | Planned | Phase 1b |

docs/skills.md

@@ -36,7 +36,7 @@ Detailed guides for every gstack skill — philosophy, workflow, and examples.
 | [`/freeze`](#safety--guardrails) | **Edit Lock** | Restrict all file edits to a single directory. Blocks Edit and Write outside the boundary. Accident prevention for debugging. |
 | [`/guard`](#safety--guardrails) | **Full Safety** | Combines /careful + /freeze in one command. Maximum safety for prod work. |
 | [`/unfreeze`](#safety--guardrails) | **Unlock** | Remove the /freeze boundary, allowing edits everywhere again. |
-| [`/open-gstack-browser`](#open-gstack-browser) | **GStack Browser** | Launch GStack Browser with sidebar, anti-bot stealth, and Claude Code integration. Watch every action live. |
+| [`/open-gstack-browser`](#open-gstack-browser) | **GStack Browser** | Launch GStack Browser with sidebar, anti-bot stealth, auto model routing, cookie import, and Claude Code integration. Watch every action live. |
 | [`/setup-deploy`](#setup-deploy) | **Deploy Configurator** | One-time setup for `/land-and-deploy`. Detects your platform, production URL, and deploy commands. |
 | [`/gstack-upgrade`](#gstack-upgrade) | **Self-Updater** | Upgrade gstack to the latest version. Detects global vs vendored install, syncs both, shows what changed. |
 
@@ -961,7 +961,7 @@ This is my **co-presence mode**.
 
 `/browse` runs headless by default. You don't see what the agent sees. `/open-gstack-browser` changes that. It launches GStack Browser (rebranded Chromium with anti-bot stealth) controlled by Playwright, with the sidebar extension auto-loaded. You watch every action in real time.
 
-The sidebar chat is a Claude instance that controls the browser. It can navigate, click, fill forms, clean up pages, take smart screenshots, edit CSS and DOM, and pass everything back to your Claude Code terminal. The menu bar says "GStack Browser" instead of "Chrome for Testing."
+The sidebar chat is a Claude instance that controls the browser. It auto-routes to the right model: Sonnet for navigation and actions (click, goto, fill, screenshot), Opus for reading and analysis (summarize, find bugs, describe). One-click cookie import from the sidebar footer. The browser stays alive as long as the window is open... no idle timeout in headed mode. The menu bar says "GStack Browser" instead of "Chrome for Testing."
 
 ```
 You:   /open-gstack-browser
@@ -969,6 +969,7 @@ You:   /open-gstack-browser
 Claude: Launched GStack Browser with sidebar extension.
         Anti-bot stealth active. All $B commands run in headed mode.
         Type in the sidebar to direct the browser agent.
+        Sidebar model routing: sonnet for actions, opus for analysis.
 ```
 
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