docs: M5d-2 checklist: given-test lifetimes and cron AND

session_slot and the scheduler tests held a temporary JSON Value across
statements (E0716). Cron now pins DOM and DOW as AND, which the given tests
had not. Gate counts from task 04 on move up by one.

Co-Authored-By: Grok 4.6 <noreply@x.ai>

docs/plans/M5d2/06-loopd-scheduler-heartbeat.md

@@ -190,14 +190,14 @@ pass so it runs once.
 
   `grep -c '^## heartbeat-prompt-unreadable$' docs/runbook.md` prints `1`.
 - [ ] **6. Run the gate.** `cargo fmt --all`, then `make gate`, timeout 600000 ms. Last line
-  `gate: ok`. Test count **1550** (1544 before, plus 6).
+  `gate: ok`. Test count **1551** (1545 before, plus 6).
 - [ ] **7. Log and commit.** Task cell `M5d2/06-loopd-scheduler-heartbeat`. Stage with
   `git add crates/loopd docs/runbook.md docs/implementer-log.md Cargo.lock`, then commit as
   `AGENTS.md` says.
 
 ## Done when
 
-- `make gate` prints `gate: ok` with 1550 tests.
+- `make gate` prints `gate: ok` with 1551 tests.
 - `git diff HEAD~1 --stat` lists only `crates/loopd/src/channel.rs`,
   `crates/loopd/src/scheduler.rs`, `crates/loopd/src/lib.rs`, `crates/loopd/src/main.rs`,
   `crates/loopd/tests/scheduler_heartbeat.rs`, `docs/runbook.md` and the log.
@@ -205,7 +205,7 @@ pass so it runs once.
 ## Stop and report if
 
 - The branch check fails; a "before" block is not found exactly once; step 2 differs; `cargo
-  check` warns; a test fails; the gate count is not 1550; you sleep in a test; you post to
+  check` warns; a test fails; the gate count is not 1551; you sleep in a test; you post to
   Mattermost; you send `slots.main`; you set a speaker; you `chmod 000`; `Held` stays private.
 
 ## What the given tests pin