refactor: replace extractRefs with schema casRef annotations

Migrate all templates to use .meta({ casRef: true }) on Zod schema
fields instead of manual extractRefs functions. Remove extractRefs
from RoleDefinition type entirely.

- develop: planner phases[].hash, coder completedPhase annotated
- solve-issue, smoke, init templates: extractRefs removed
- create-workflow.ts: uses collectCasRefs(schema, meta)
- RoleDefinition: extractRefs field removed (breaking)

218 tests pass, 0 fail.

Fixes #289, Refs #285

packages/cli-workflow/src/commands/init/templates.ts

@@ -51,7 +51,6 @@ export const greeterRole: RoleDefinition<HelloTemplateMeta["greeter"]> = {
   description: "Says hello — replace with your first role.",
   systemPrompt: "You are a helpful assistant. Reply with one short friendly sentence.",
   schema: greeterMetaSchema,
-  extractRefs: null,
 };
 `;
 }