refactor(task): align continuation ids with task_id

src/agents/sisyphus/default.ts

@@ -389,15 +389,15 @@ AFTER THE WORK YOU DELEGATED SEEMS DONE, ALWAYS VERIFY THE RESULTS AS FOLLOWING:
 
 ### Session Continuity (MANDATORY)
 
-Every \`task()\` output includes a session_id. **USE IT.**
+Every \`task()\` output includes a task_id. **USE IT.**
 
 **ALWAYS continue when:**
-- Task failed/incomplete → \`session_id="{session_id}", prompt="Fix: {specific error}"\`
-- Follow-up question on result → \`session_id="{session_id}", prompt="Also: {question}"\`
-- Multi-turn with same agent → \`session_id="{session_id}"\` - NEVER start fresh
-- Verification failed → \`session_id="{session_id}", prompt="Failed verification: {error}. Fix."\`
+- Task failed/incomplete → \`task_id="{task_id}", prompt="Fix: {specific error}"\`
+- Follow-up question on result → \`task_id="{task_id}", prompt="Also: {question}"\`
+- Multi-turn with same agent → \`task_id="{task_id}"\` - NEVER start fresh
+- Verification failed → \`task_id="{task_id}", prompt="Failed verification: {error}. Fix."\`
 
-**Why session_id is CRITICAL:**
+**Why task_id is CRITICAL:**
 - Subagent has FULL conversation context preserved
 - No repeated file reads, exploration, or setup
 - Saves 70%+ tokens on follow-ups
@@ -408,10 +408,10 @@ Every \`task()\` output includes a session_id. **USE IT.**
 task(category="quick", load_skills=[], run_in_background=false, description="Fix type error", prompt="Fix the type error in auth.ts...")
 
 // CORRECT: Resume preserves everything
-task(session_id="ses_abc123", load_skills=[], run_in_background=false, description="Fix type error", prompt="Fix: Type error on line 42")
+task(task_id="ses_abc123", load_skills=[], run_in_background=false, description="Fix type error", prompt="Fix: Type error on line 42")
 \`\`\`
 
-**After EVERY delegation, STORE the session_id for potential continuation.**
+**After EVERY delegation, STORE the task_id for potential continuation.**
 
 ### Code Changes:
 - Match existing patterns (if codebase is disciplined)

src/agents/sisyphus/gpt-5-4.ts

@@ -387,10 +387,10 @@ Post-delegation: delegation never substitutes for verification. Always run \`<ve
 
 ### Session continuity
 
-Every \`task()\` returns a session_id. Use it for all follow-ups:
-- Failed/incomplete → \`session_id="{id}", prompt="Fix: {specific error}"\`
-- Follow-up → \`session_id="{id}", prompt="Also: {question}"\`
-- Multi-turn → always \`session_id\`, never start fresh
+Every \`task()\` returns a task_id. Use it for all follow-ups:
+- Failed/incomplete → \`task_id="{id}", prompt="Fix: {specific error}"\`
+- Follow-up → \`task_id="{id}", prompt="Also: {question}"\`
+- Multi-turn → always \`task_id\`, never start fresh
 
 This preserves full context, avoids repeated exploration, saves 70%+ tokens.