feat: generate implementation plan and design artifacts

.gemini/commands/plan.toml

@@ -0,0 +1,40 @@
+description = "Execute the implementation planning workflow using the plan template to generate design artifacts."
+
+prompt = """
+---
+description: Execute the implementation planning workflow using the plan template to generate design artifacts.
+---
+
+Given the implementation details provided as an argument, do this:
+
+1. Run `.specify/scripts/bash/setup-plan.sh --json` from the repo root and parse JSON for FEATURE_SPEC, IMPL_PLAN, SPECS_DIR, BRANCH. All future file paths must be absolute.
+2. Read and analyze the feature specification to understand:
+   - The feature requirements and user stories
+   - Functional and non-functional requirements
+   - Success criteria and acceptance criteria
+   - Any technical constraints or dependencies mentioned
+
+3. Read the constitution at `.specify/memory/constitution.md` to understand constitutional requirements.
+
+4. Execute the implementation plan template:
+   - Load `.specify/templates/plan-template.md` (already copied to IMPL_PLAN path)
+   - Set Input path to FEATURE_SPEC
+   - Run the Execution Flow (main) function steps 1-9
+   - The template is self-contained and executable
+   - Follow error handling and gate checks as specified
+   - Let the template guide artifact generation in $SPECS_DIR:
+     * Phase 0 generates research.md
+     * Phase 1 generates data-model.md, contracts/, quickstart.md
+     * Phase 2 generates tasks.md
+   - Incorporate user-provided details from arguments into Technical Context: {{args}}
+   - Update Progress Tracking as you complete each phase
+
+5. Verify execution completed:
+   - Check Progress Tracking shows all phases complete
+   - Ensure all required artifacts were generated
+   - Confirm no ERROR states in execution
+
+6. Report results with branch name, file paths, and generated artifacts.
+
+Use absolute paths with the repository root for all file operations to avoid path issues.
+"""