update convert to phased and phase authoring

phase-authoring/assets/phase-template.md

@@ -0,0 +1,26 @@
+# Phase {{NN}} — {{Short Title}}
+
+**Story:** `{{.agent/user_stories/<story>.md or "n/a"}}`
+**Context:** `{{PLAN.md sections / files this phase builds on}}`
+
+## Objective
+{{1–3 sentences: what this phase delivers}}
+
+## Dependencies
+- `{{NN_name}}` ({{complete|todo}}) — {{what is needed from it}}
+{{or "— (none)"}}
+
+## Tasks
+1. `{{path/to/file}}` — {{specific change, file-level detail}}
+2. `{{path/to/file}}` — {{specific change}}
+
+## Testing & Quality
+- Unit/integration: {{tests required for all new logic — name the behaviors to cover}}
+- Coverage: **>90%** on new/modified code
+{{project additions, e.g. a dedicated Playwright E2E suite run in isolation}}
+
+## Completion Criteria
+- [ ] {{observable check: command to run / endpoint to hit / artifact to exist}}
+- [ ] test suite green, coverage >90%
+- [ ] no behavior change in completed phases
+{{project additions, e.g. a commit command per AGENTS.md conventions}}