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/M5d2/03-loopd-heartbeat-config.md

@@ -193,21 +193,21 @@ If `main.rs` already has `use loopd::tools::{Registry, ToolPort};`, write `Regis
 - [ ] **5. Check.** `git diff --stat` lists `crates/loopd/src/config.rs` and
   `crates/loopd/src/main.rs`. `git status --short` shows the new test and `config/heartbeat.md`.
 - [ ] **6. Run the gate.** `cargo fmt --all`, then `make gate`, timeout 600000 ms. Last line
-  `gate: ok`. Test count **1525** (1517 before, plus 8).
+  `gate: ok`. Test count **1526** (1518 before, plus 8).
 - [ ] **7. Log and commit.** Task cell `M5d2/03-loopd-heartbeat-config`. Stage with
   `git add crates/loopd config/heartbeat.md docs/implementer-log.md Cargo.lock`, then commit
   as `AGENTS.md` says.
 
 ## Done when
 
-- `make gate` prints `gate: ok` with 1525 tests.
+- `make gate` prints `gate: ok` with 1526 tests.
 - `git diff HEAD~1 --stat` lists only `crates/loopd/src/config.rs`, `crates/loopd/src/main.rs`,
   `crates/loopd/tests/config_heartbeat.rs`, `config/heartbeat.md` and the log.
 
 ## 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 1525; you join `heartbeat.prompt` onto
+  check` warns; a test fails; the gate count is not 1526; you join `heartbeat.prompt` onto
   `system.md`'s directory instead of the config file's parent; you reject an empty `summarise`
   list; you check names inside `parse`.