Fix all OpenSpec validation failures (36/36 passing)

- Add ## Purpose sections and convert delta headers to ## Requirements
  on all 25 specs
- Add SHALL keywords to requirements missing them (gpx-import,
  planner-session, planner-journal-handoff)
- Convert prose GPX format section to proper scenarios (no-go-areas)
- Create specs/ delta files for 7 changes that were missing them
  (activity-photos, local-dev-stack, multi-day-routes, route-discovery,
  route-sharing, visual-redesign, waypoint-notes)

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

openspec/changes/local-dev-stack/specs/local-dev-environment/spec.md

@@ -0,0 +1,29 @@
+## MODIFIED Requirements
+
+### Requirement: Optional local monitoring stack
+The dev environment SHALL support an optional monitoring profile matching the production stack.
+
+#### Scenario: Start with monitoring
+- **WHEN** a developer runs `pnpm dev:full` with `--profile monitoring`
+- **THEN** Prometheus, Grafana, and Loki start alongside the app services
+
+### Requirement: Production-aligned PostgreSQL config
+The dev PostgreSQL SHALL match production configuration including pg_stat_statements.
+
+#### Scenario: pg_stat_statements available
+- **WHEN** the dev PostgreSQL container starts
+- **THEN** pg_stat_statements is enabled via initialization scripts
+
+### Requirement: Database seed script
+The dev environment SHALL provide a seed script for consistent test data.
+
+#### Scenario: Seed database
+- **WHEN** a developer runs the seed script
+- **THEN** test users, routes, and activities are created in the local database
+
+### Requirement: Dev environment reset
+The dev environment SHALL provide a command to tear down and recreate the local stack.
+
+#### Scenario: Reset dev environment
+- **WHEN** a developer runs `pnpm dev:reset`
+- **THEN** all Docker volumes are removed, containers are recreated, and the database is re-seeded