[Spec Kit] Implementation progress

.github/agents/speckit.plan.agent.md

@@ -139,15 +139,11 @@ You **MUST** consider the user input before proceeding (if not empty).
    - Skip if project is purely internal (build scripts, one-off tools, etc.)
 
 3. **Agent context update**:
-   - Run `.specify/scripts/bash/update-agent-context.sh copilot`
-   - These scripts detect which AI agent is in use
-   - Update the appropriate agent-specific context file
-   - Add only new technology from current plan
-   - Preserve manual additions between markers
+   - Update the plan reference between the `<!-- SPECKIT START -->` and `<!-- SPECKIT END -->` markers in `.github/copilot-instructions.md` to point to the plan file created in step 1 (the IMPL_PLAN path)
 
-**Output**: data-model.md, /contracts/*, quickstart.md, agent-specific file
+**Output**: data-model.md, /contracts/*, quickstart.md, updated agent context file
 
 ## Key rules
 
-- Use absolute paths
+- Use absolute paths for filesystem operations; use project-relative paths for references in documentation and agent context files
 - ERROR on gate failures or unresolved clarifications