docs: record Wave 2 chapel-multilocale in CHANGELOG + ROADMAP

CHANGELOG.md gets an Added-2026-06-01 entry for #99 (option A closure
of #87): 7th strict chapel-ci gate, gasnet+smp single-host
oversubscribed, source-built + $CHPL_HOME-cached, cross-locale
verification via system-image-*.json grep.

ROADMAP.adoc v3.0.0 'Multi-machine orchestration' bullet split into
two: [x] single-host oversubscribed (Wave 2 landed) and
[ ] cross-node gasnet/ofi over a real NIC (Wave 3, needs cluster
runner).

Author: hyperpolymath

CHANGELOG.md

@@ -2,6 +2,23 @@
 
 ## [Unreleased]
 
+### Added (2026-06-01) — Chapel Wave 2: single-host multilocale gate
+- **`chapel-multilocale` CI gate** (#99, closes #87 option A): adds a 7th
+  strict chapel-ci job that builds Chapel 2.8.0 from source with
+  `CHPL_COMM=gasnet` + `CHPL_COMM_SUBSTRATE=smp` + `CHPL_LAUNCHER=smp`,
+  caches `$CHPL_HOME` (`actions/cache@v4`, stable key with manual
+  `CHAPEL_MULTILOCALE_CACHE_GEN` invalidation counter; cold build
+  ~30-40 min, warm restore ~30s for 7 days), runs
+  `mass-panic --numLocales=2` against a synthetic 2-repo corpus, and
+  greps the emitted `system-image-*.json` for both repo names to prove
+  cross-locale aggregation actually executed. The Wave 1 binary `.deb`
+  install path is single-locale only; this gate closes the gap.
+- Aggregator `chapel-ci-gate` updated to wait on the 7th job and to
+  surface it as `multilocale=<result>` in the gate summary.
+- Wave 3 (`gasnet/ofi` over a real NIC across cluster nodes) and the
+  ~50-repo "~5-15% slower" benchmark from `chapel/README.md` remain
+  parked — both need a beefier or self-hosted runner to be meaningful.
+
 ### Fixed (2026-06-01) — baseline-red corrective maintenance
 - **Dogfood Gate A2ML validation** restored (#94, #97): bumped
   `hyperpolymath/a2ml-validate-action` from `59145c7d` to `6bff6ec` to

ROADMAP.adoc

@@ -183,7 +183,9 @@ but panic-attack flags these as generic UnsafeCode findings.
 * [x] Temporal diff subcommand: `--subcommand=diff` with global health/risk/weak-point deltas
 * [x] Single-locale scan validated against 303-repo estate (2026-04-12)
 * [ ] Per-node temporal diff: load full SystemImage JSON for per-repo health breakdown
-* [ ] Multi-machine orchestration: gasnet/ofi multi-locale Chapel run across cluster nodes
+* [~] Multi-locale Chapel orchestration:
+  ** [x] Single-host oversubscribed `gasnet+smp` (Wave 2, panic-attack#99 / #87 option A): `chapel-multilocale` CI gate exercises `mass-panic --numLocales=2` on a 2-repo synthetic corpus. Source-built Chapel cached on `$CHPL_HOME` (cold ~30-40 min, warm ~30s restore).
+  ** [ ] Cross-node `gasnet/ofi` over a real NIC (Wave 3): needs cluster runner — not exercisable on default GH runners.
 * [ ] VeriSimDB HTTP push from Chapel metalayer (currently file-only)
 * [x] `--scheduler=queue` — resumable dynamic work-pull scheduler for mass-panic. Atomic fetch-add work index shared across locales; per-run JSONL journal shards (`locale-<id>-<runId>.jsonl`) recording `{claim, done}` state per repo with full RepoResult payload on `done`; `--resume` replays every shard in the journal directory, reconstructs RepoResult records from prior runs, and skips those repos on the new run. ~5–15% slower than static on clean runs; a crash or Ctrl+C loses only the in-flight repo per locale. See `chapel/README.md` §Scheduling modes for the full spec.