fix(prompts): prefer task_id in continuation guidance

src/hooks/atlas/index.test.ts

@@ -520,7 +520,7 @@ session_id: ses_standalone_def
       cleanupMessageStorage(sessionID)
     })
 
-     test("should include session_id and checkbox instructions in reminder", async () => {
+     test("should include task_id and checkbox instructions in reminder", async () => {
        // given - boulder state, Atlas caller
        const sessionID = "session-resume-test"
        setupMessageStorage(sessionID, "atlas")

src/hooks/atlas/system-reminder-templates.ts

@@ -98,7 +98,7 @@ Answer honestly:
 ALL three must be YES. "Probably" = NO. "I think so" = NO. Investigate until CERTAIN.
 
 - **All 3 YES** - Proceed: mark task complete, move to next.
-- **Any NO** - Reject: resume session with \`session_id\`, fix the specific issue.
+- **Any NO** - Reject: resume with \`task_id\`, fix the specific issue.
 - **Unsure** - Reject: "unsure" = "no". Investigate until you have a definitive answer.
 
 **DO NOT proceed to the next task until all 4 phases are complete and the gate passes.**`