docs: M5d-2 gate count 1508 and OpenCode model id

The M5d-1 gate on straylight is 1508, so every M5d-2 expected count moves up by one.
OpenCode 1.15.10 serves Ornith as llama.cpp/ornith-1.5-35b-a3b.

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 **1549** (1543 before, plus 6).
+  `gate: ok`. Test count **1550** (1544 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 1549 tests.
+- `make gate` prints `gate: ok` with 1550 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 1549; you sleep in a test; you post to
+  check` warns; a test fails; the gate count is not 1550; 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