refactor(task-generate-agent): optimize N+1 parallel planning prompts

- Phase 2B: Add structured agent prompt with TASK OBJECTIVE, MODULE SCOPE,
  SESSION PATHS, CONTEXT METADATA, CROSS-MODULE DEPENDENCIES sections
- Phase 3: Convert from function calls to agent invocation with complete
  prompt structure for IMPL_PLAN.md and TODO_LIST.md generation
- Align prompt structure with Phase 2A (Single Agent) for consistency
- Reference agent specification for template details instead of inline docs
- Add dependency resolution algorithm for CROSS:: placeholder resolution

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/commands/workflow/tools/task-generate-agent.md

@@ -219,7 +219,9 @@ Hard Constraints:
 
 **Condition**: `modules.length >= 2` (multi-module detected)
 
-**Purpose**: Launch N action-planning-agents simultaneously, one per module, for parallel task generation.
+**Purpose**: Launch N action-planning-agents simultaneously, one per module, for parallel task JSON generation.
+
+**Note**: Phase 2B agents generate Task JSONs ONLY. IMPL_PLAN.md and TODO_LIST.md are generated by Phase 3 Coordinator.
 
 **Parallel Agent Invocation**:
 ```javascript
@@ -227,27 +229,49 @@ Hard Constraints:
 const planningTasks = modules.map(module =>
   Task(
     subagent_type="action-planning-agent",
-    description=`Plan ${module.name} module`,
+    description=`Generate ${module.name} module task JSONs`,
     prompt=`
-## SCOPE
+## TASK OBJECTIVE
+Generate task JSON files for ${module.name} module within workflow session
+
+IMPORTANT: This is PLANNING ONLY - generate task JSONs, NOT implementing code.
+IMPORTANT: Generate Task JSONs ONLY. IMPL_PLAN.md and TODO_LIST.md by Phase 3 Coordinator.
+
+CRITICAL: Follow progressive loading strategy in agent specification
+
+## MODULE SCOPE
 - Module: ${module.name} (${module.type})
 - Focus Paths: ${module.paths.join(', ')}
 - Task ID Prefix: IMPL-${module.prefix}
 - Task Limit: ≤9 tasks
 - Other Modules: ${otherModules.join(', ')}
-- Cross-module deps format: "CROSS::{module}::{pattern}"
 
 ## SESSION PATHS
 Input:
+  - Session Metadata: .workflow/active/{session-id}/workflow-session.json
   - Context Package: .workflow/active/{session-id}/.process/context-package.json
 Output:
   - Task Dir: .workflow/active/{session-id}/.task/
 
-## INSTRUCTIONS
-- Generate tasks ONLY for ${module.name} module
-- Use task ID format: IMPL-${module.prefix}1, IMPL-${module.prefix}2, ...
-- For cross-module dependencies, use: depends_on: ["CROSS::B::api-endpoint"]
-- Maximum 9 tasks per module
+## CONTEXT METADATA
+Session ID: {session-id}
+MCP Capabilities: {exa_code, exa_web, code_index}
+
+## CROSS-MODULE DEPENDENCIES
+- Use placeholder: depends_on: ["CROSS::{module}::{pattern}"]
+- Example: depends_on: ["CROSS::B::api-endpoint"]
+- Phase 3 Coordinator resolves to actual task IDs
+
+## EXPECTED DELIVERABLES
+Task JSON Files (.task/IMPL-${module.prefix}*.json):
+  - 6-field schema per agent specification
+  - Task ID format: IMPL-${module.prefix}1, IMPL-${module.prefix}2, ...
+  - Focus ONLY on ${module.name} module scope
+
+## SUCCESS CRITERIA
+- Task JSONs saved to .task/ with IMPL-${module.prefix}* naming
+- Cross-module dependencies use CROSS:: placeholder format
+- Return task count and brief summary
     `
   )
 );
@@ -271,37 +295,78 @@ await Promise.all(planningTasks);
 - Prefix: A, B, C... (assigned by detection order)
 - Sequence: 1, 2, 3... (per-module increment)
 
-### Phase 3: Integration (+1 Coordinator, Multi-Module Only)
+### Phase 3: Integration (+1 Coordinator Agent, Multi-Module Only)
 
 **Condition**: Only executed when `modules.length >= 2`
 
-**Purpose**: Collect all module tasks, resolve cross-module dependencies, generate unified documents.
+**Purpose**: Collect all module tasks, resolve cross-module dependencies, generate unified IMPL_PLAN.md and TODO_LIST.md documents.
 
-**Integration Logic**:
+**Coordinator Agent Invocation**:
 ```javascript
-// 1. Collect all module task JSONs
-const allTasks = glob('.task/IMPL-*.json').map(loadJson);
+// Wait for all Phase 2B agents to complete
+const moduleResults = await Promise.all(planningTasks);
 
-// 2. Resolve cross-module dependencies
-for (const task of allTasks) {
-  if (task.depends_on) {
-    task.depends_on = task.depends_on.map(dep => {
-      if (dep.startsWith('CROSS::')) {
-        // CROSS::B::api-endpoint → find matching IMPL-B* task
-        const [, targetModule, pattern] = dep.match(/CROSS::(\w+)::(.+)/);
-        return findTaskByModuleAndPattern(allTasks, targetModule, pattern);
-      }
-      return dep;
-    });
-  }
-}
+// Launch +1 Coordinator Agent
+Task(
+  subagent_type="action-planning-agent",
+  description="Integrate module tasks and generate unified documents",
+  prompt=`
+## TASK OBJECTIVE
+Integrate all module task JSONs, resolve cross-module dependencies, and generate unified IMPL_PLAN.md and TODO_LIST.md
 
-// 3. Generate unified IMPL_PLAN.md (grouped by module)
-generateIMPL_PLAN(allTasks, modules);
+IMPORTANT: This is INTEGRATION ONLY - consolidate existing task JSONs, NOT creating new tasks.
 
-// 4. Generate TODO_LIST.md (hierarchical structure)
-generateTODO_LIST(allTasks, modules);
+## SESSION PATHS
+Input:
+  - Session Metadata: .workflow/active/{session-id}/workflow-session.json
+  - Context Package: .workflow/active/{session-id}/.process/context-package.json
+  - Task JSONs: .workflow/active/{session-id}/.task/IMPL-*.json (from Phase 2B)
+Output:
+  - Updated Task JSONs: .workflow/active/{session-id}/.task/IMPL-*.json (resolved dependencies)
+  - IMPL_PLAN: .workflow/active/{session-id}/IMPL_PLAN.md
+  - TODO_LIST: .workflow/active/{session-id}/TODO_LIST.md
+
+## CONTEXT METADATA
+Session ID: {session-id}
+Modules: ${modules.map(m => m.name + '(' + m.prefix + ')').join(', ')}
+Module Count: ${modules.length}
+
+## INTEGRATION STEPS
+1. Collect all .task/IMPL-*.json, group by module prefix
+2. Resolve CROSS:: dependencies → actual task IDs, update task JSONs
+3. Generate IMPL_PLAN.md (multi-module format per agent specification)
+4. Generate TODO_LIST.md (hierarchical format per agent specification)
+
+## CROSS-MODULE DEPENDENCY RESOLUTION
+- Pattern: CROSS::{module}::{pattern} → IMPL-{module}* matching title/context
+- Example: CROSS::B::api-endpoint → IMPL-B1 (if B1 title contains "api-endpoint")
+- Log unresolved as warnings
+
+## EXPECTED DELIVERABLES
+1. Updated Task JSONs with resolved dependency IDs
+2. IMPL_PLAN.md - multi-module format with cross-dependency section
+3. TODO_LIST.md - hierarchical by module with cross-dependency section
+
+## SUCCESS CRITERIA
+- No CROSS:: placeholders remaining in task JSONs
+- IMPL_PLAN.md and TODO_LIST.md generated with multi-module structure
+- Return: task count, per-module breakdown, resolved dependency count
+  `
+)
 ```
 
-**Note**: IMPL_PLAN.md and TODO_LIST.md structure definitions are in `action-planning-agent.md`.
+**Dependency Resolution Algorithm**:
+```javascript
+function resolveCrossModuleDependency(placeholder, allTasks) {
+  const [, targetModule, pattern] = placeholder.match(/CROSS::(\w+)::(.+)/);
+  const candidates = allTasks.filter(t =>
+    t.id.startsWith(`IMPL-${targetModule}`) &&
+    (t.title.toLowerCase().includes(pattern.toLowerCase()) ||
+     t.context?.description?.toLowerCase().includes(pattern.toLowerCase()))
+  );
+  return candidates.length > 0
+    ? candidates.sort((a, b) => a.id.localeCompare(b.id))[0].id
+    : placeholder; // Keep for manual resolution
+}
+```