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docs/spec/07-implementation-phases-todo.md

@@ -239,3 +239,29 @@ Acceptance criteria:
 
 - the codebase can later add rule-based sizing without redesigning circuits/devices
 - users can manually override calculated suggestions
+
+## Phase 9: Development Environment and Docker
+
+Goal:
+
+Make short development sessions quick to start and stop.
+
+Tasks:
+
+- add a Docker-based local development setup
+- start frontend, API and SQLite persistence with one command
+- keep the database in an explicit persistent volume
+- run or document pending database migrations during startup
+- add concise start, stop and reset instructions
+- retain a non-Docker development path for direct debugging
+
+Acceptance criteria:
+
+- a new development session starts with one documented command
+- stopping and restarting does not lose the local database
+- frontend and API health can be checked without manual port setup
+- the development workflow works consistently across short sessions
+
+Note:
+
+This phase may be moved earlier if repeated local startup overhead begins to slow down feature development.