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/M5d2/01-loopd-session-slot.md

@@ -89,7 +89,7 @@ become
   --test compact_turn`: every test passes, 4 in `session_slot` and the others as before.
 - [ ] **5. Check.** `git diff --stat` lists exactly `crates/loopd/src/turn.rs`.
 - [ ] **6. Run the gate.** `cargo fmt --all`, then `make gate`, with a shell timeout of 600000 ms.
-  Expected last line: `gate: ok`. The test count is **1511** after this task, 1507 before it,
+  Expected last line: `gate: ok`. The test count is **1512** after this task, 1508 before it,
   and the 4 new ones are the tests of `session_slot.rs`. To count, add up the `N passed` of
   every `test result:` line the gate's `cargo test --workspace` printed, and add 1. Never run
   the gate again only to count.
@@ -100,7 +100,7 @@ become
 
 ## Done when
 
-- `make gate` prints `gate: ok` with 1511 tests.
+- `make gate` prints `gate: ok` with 1512 tests.
 - `git diff HEAD~1 --stat` lists only `crates/loopd/src/turn.rs`,
   `crates/loopd/tests/session_slot.rs` and `docs/implementer-log.md`.
 
@@ -115,7 +115,7 @@ become
 - The fix seems to need a change anywhere else. It does not; stop and say why you think so.
 - A test outside `session_slot.rs` fails in the gate: check once whether it fails without your
   change (`git stash -u`, run it, `git stash pop`), then stop and report both results.
-- The gate passes with a count other than 1511.
+- The gate passes with a count other than 1512.
 
 ## What the given tests pin