refactor(task): align continuation ids with task_id

src/agents/atlas/default-prompt-sections.ts

@@ -150,16 +150,16 @@ task(
 
 ### 3.5 Handle Failures (USE RESUME)
 
-**CRITICAL: When re-delegating, ALWAYS use \`session_id\` parameter.**
+**CRITICAL: When re-delegating, ALWAYS use \`task_id\` parameter.**
 
-Every \`task()\` output includes a session_id. STORE IT.
+Every \`task()\` output includes a task_id. STORE IT.
 
 If task fails:
 1. Identify what went wrong
 2. **Resume the SAME session** - subagent has full context already:
     \`\`\`typescript
     task(
-      session_id="ses_xyz789",  // Session from failed task
+      task_id="ses_xyz789",  // Task ID from failed task
       load_skills=[...],
       prompt="FAILED: {error}. Fix by: {specific instruction}"
     )
@@ -167,7 +167,7 @@ If task fails:
 3. Maximum 3 retry attempts with the SAME session
 4. If blocked after 3 attempts: Document and continue to independent tasks
 
-**Why session_id is MANDATORY for failures:**
+**Why task_id is MANDATORY for failures:**
 - Subagent already read all files, knows the context
 - No repeated exploration = 70%+ token savings
 - Subagent knows what approaches already failed
@@ -292,6 +292,6 @@ export const DEFAULT_ATLAS_CRITICAL_RULES = `<critical_overrides>
 - Pass inherited wisdom to every subagent
 - Parallelize independent tasks
 - Verify with your own tools
-- **Store session_id from every delegation output**
-- **Use \`session_id="{session_id}"\` for retries, fixes, and follow-ups**
+- **Store task_id from every delegation output**
+- **Use \`task_id="{task_id}"\` for retries, fixes, and follow-ups**
 </critical_overrides>`

src/agents/atlas/gemini-prompt-sections.ts

@@ -164,10 +164,10 @@ Count remaining **top-level task** checkboxes. Ignore nested verification/eviden
 
 ### 3.5 Handle Failures
 
-**CRITICAL: Use \`session_id\` for retries.**
+**CRITICAL: Use \`task_id\` for retries.**
 
 \`\`\`typescript
-task(session_id="ses_xyz789", load_skills=[...], prompt="FAILED: {error}. Fix by: {instruction}")
+task(task_id="ses_xyz789", load_skills=[...], prompt="FAILED: {error}. Fix by: {instruction}")
 \`\`\`
 
 - Maximum 3 retries per task

src/agents/atlas/gpt-prompt-sections.ts

@@ -169,10 +169,10 @@ Count remaining **top-level task** checkboxes. Ignore nested verification/eviden
 
 ### 3.5 Handle Failures
 
-**CRITICAL: Use \`session_id\` for retries.**
+**CRITICAL: Use \`task_id\` for retries.**
 
 \`\`\`typescript
-task(session_id="ses_xyz789", load_skills=[...], prompt="FAILED: {error}. Fix by: {instruction}")
+task(task_id="ses_xyz789", load_skills=[...], prompt="FAILED: {error}. Fix by: {instruction}")
 \`\`\`
 
 - Maximum 3 retries per task