chore: bootstrap trellis workspace and sync deployment settings

AGENTS.md

@@ -30,6 +30,14 @@ Do not place backend/frontend implementation details here.
 - Keep AGENTS layered and lean: shared rules at root, domain rules in sub-AGENTS.
 - **No Error Swallowing**: All exceptions must propagate or be converted to typed errors. Never catch an exception, log it, and silently continue. This destroys debuggability.
 
+## Git Safety (CRITICAL)
+
+- **NEVER execute `git checkout -- <file>` or any git command that modifies files without explicit user approval.**
+- **NEVER reset, revert, or discard uncommitted changes without user consent.**
+- If you need to discard changes, ask the user first and explain exactly what will be lost.
+- Before any destructive git operation, list the affected files and get confirmation.
+- This rule is non-negotiable. Violation will cause irreversible loss of user work.
+
 ## Protocol Source of Truth
 
 `docs/protocols/` is the single source of truth for protocol and data format.
@@ -41,3 +49,26 @@ Do not place backend/frontend implementation details here.
 ## Database Access
 
 When viewing data in the database, use `supabase mcp` tools (`supabase_execute_sql`, `supabase_list_tables`, etc.) instead of direct queries or other methods.
+
+## Image Handling
+
+When reading images, check whether the model has native multimodal capability first. If it does, use `Read` tool to read images directly. If it does not, fall back to `understand_image` tool. Only use `Read` tool for non-image files.
+
+<!-- TRELLIS:START -->
+# Trellis Instructions
+
+These instructions are for AI assistants working in this project.
+
+Use the `/trellis:start` command when starting a new session to:
+- Initialize your developer identity
+- Understand current project context
+- Read relevant guidelines
+
+Use `@/.trellis/` to learn:
+- Development workflow (`workflow.md`)
+- Project structure guidelines (`spec/`)
+- Developer workspace (`workspace/`)
+
+Keep this managed block so 'trellis update' can refresh the instructions.
+
+<!-- TRELLIS:END -->