refactor: simplify ExtractFn to (schema, contentHash)

- Remove extractPrompt from RoleDefinition
- Remove ExtractContext type
- ExtractFn now takes (schema, contentHash) instead of (schema, prompt, ExtractContext)
- createExtract reads CAS content by hash, keeps ReAct loop with cas_get
- Coder schema uses .describe() for phase hash hint
- All role definitions, CLI templates, and skill output updated

Refs #180, closes #174, closes #181

packages/workflow-template-develop/src/roles/coder.ts

@@ -2,7 +2,7 @@ import type { RoleDefinition } from "@uncaged/workflow-runtime";
 import * as z from "zod/v4";
 
 export const coderMetaSchema = z.object({
-  completedPhase: z.string(),
+  completedPhase: z.string().describe("The planner phase hash finished this round. If multiple phases were completed, use the last finished phase hash."),
   filesChanged: z.array(z.string()),
   summary: z.string(),
 });
@@ -27,8 +27,6 @@ export const coderRole: RoleDefinition<CoderMeta> = {
   description:
     "Implements the next incomplete planner phase and reports structured completion metadata.",
   systemPrompt: CODER_SYSTEM,
-  extractPrompt:
-    "Extract completedPhase: the planner phase hash finished this round (exact hash string from the plan). If multiple phases were finished in one round, use the last finished phase hash. Extract filesChanged and a summary of the work.",
   schema: coderMetaSchema,
   extractRefs: (meta) => [meta.completedPhase],
 };

packages/workflow-template-develop/src/roles/committer.ts

@@ -28,8 +28,6 @@ Do not attempt to fix failures yourself.`;
 export const committerRole: RoleDefinition<CommitterMeta> = {
   description: "Creates a branch and commits changes.",
   systemPrompt: COMMITTER_SYSTEM,
-  extractPrompt:
-    "Extract the commit result: committed (with branch and SHA), recoverable failure, or unrecoverable failure. Include error details and log references if applicable.",
   schema: committerMetaSchema,
   extractRefs: null,
 };

packages/workflow-template-develop/src/roles/planner.ts

@@ -44,8 +44,6 @@ Order phases so earlier steps unblock later ones. Cover root cause, edge cases,
 export const plannerRole: RoleDefinition<PlannerMeta> = {
   description: "Breaks the task into sequential phases for the coder.",
   systemPrompt: PLANNER_SYSTEM,
-  extractPrompt:
-    "Extract the implementation phases from the agent's output. Each phase has a hash (the CAS content-hash returned by the cas put command) and a title (one-line summary).",
   schema: plannerMetaSchema,
   extractRefs: (meta) => meta.phases.map((p) => p.hash),
 };

packages/workflow-template-develop/src/roles/reviewer.ts

@@ -37,8 +37,6 @@ Be thorough. A false approve costs more than a false reject.`;
 export const reviewerRole: RoleDefinition<ReviewerMeta> = {
   description: "Runs git diff checks and sets approved when the change is ready.",
   systemPrompt: REVIEWER_SYSTEM,
-  extractPrompt:
-    "Extract the review verdict: approved or rejected. If rejected, list the blocking issues.",
   schema: reviewerMetaSchema,
   extractRefs: null,
 };

packages/workflow-template-develop/src/roles/tester.ts

@@ -19,8 +19,6 @@ const TESTER_SYSTEM = `You are a tester. Run the project's test suite, build, an
 export const testerRole: RoleDefinition<TesterMeta> = {
   description: "Runs test, build, and lint commands and reports pass or fail with details.",
   systemPrompt: TESTER_SYSTEM,
-  extractPrompt:
-    "Extract the verification result: passed with summary details, or failed with details of what broke.",
   schema: testerMetaSchema,
   extractRefs: null,
 };