fix(test): cap local unit-test concurrency at 4 to avoid exhausting commit charge (#13187)

Aligns the two hand-typed local scripts with `test:unit:ci`, which already ran at concurrency 4; `--test-force-exit` was likewise the one flag `test` was missing. CI scripts are untouched.

---

Validated in one consolidated worktree cut from `release/v3.8.51`, boarded together with the other 13 PRs of this batch — zero merge conflicts between them.

- `typecheck:core` clean
- complexity 2799 / baseline 3218 and cognitive-complexity 1265 / baseline 1437 — both under baseline
- 71 focused assertions green across the 13 test files this batch adds or touches

⚠️ base-red inherited: #12732 — `Docs Gates (fast-path)`, `Merge integrity`, `No new ESLint warnings`, `Unit Tests fast-path` and `Fast Quality Gates` all reproduce on the pure `release/v3.8.51` tip (provider count 356 vs the 358 the modules define, SKILL.md drift, and `open-sse/utils/stream.ts` at 3115 > frozen 3098). None of them touch this diff.

Thanks @anhtahaylove — the root-cause write-up, the measured before/after numbers and the red-before-green proof on every one of these made the batch reviewable as a unit.

changelog.d/fixes/local-test-concurrency.md

@@ -0,0 +1 @@
+- **fix(test):** run the local `test` and `test:unit` scripts at concurrency 4 so a full-suite run no longer exhausts the machine's commit charge and kills unrelated processes

package.json

@@ -125,8 +125,8 @@
     "electron:build:mac": "npm run build && cd electron && npm run build:mac",
     "electron:build:linux": "npm run build && cd electron && npm run build:linux",
     "electron:smoke:packaged": "node scripts/dev/smoke-electron-packaged.mjs",
-    "test": "cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-concurrency=20 tests/unit/*.test.ts \"tests/unit/{api,auth,authz,build,cli,cli-helper,combo,compression,correctness,cors,db,db-adapters,docs,gamification,guardrails,lib,mcp,memory,runtime,security,services,settings,shared,translator,ui,usage}/**/*.test.ts\" \"tests/unit/**/*.test.mjs\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-concurrency=20 \"tests/unit/dashboard/**/*.test.ts\"",
-    "test:unit": "cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=20 tests/unit/*.test.ts \"tests/unit/{api,auth,authz,build,cli,cli-helper,combo,compression,correctness,cors,db,db-adapters,docs,gamification,guardrails,lib,mcp,memory,runtime,security,services,settings,shared,translator,ui,usage}/**/*.test.ts\" \"tests/unit/**/*.test.mjs\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=20 \"tests/unit/dashboard/**/*.test.ts\" && npm run test:unit:serial",
+    "test": "cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 tests/unit/*.test.ts \"tests/unit/{api,auth,authz,build,cli,cli-helper,combo,compression,correctness,cors,db,db-adapters,docs,gamification,guardrails,lib,mcp,memory,runtime,security,services,settings,shared,translator,ui,usage}/**/*.test.ts\" \"tests/unit/**/*.test.mjs\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 \"tests/unit/dashboard/**/*.test.ts\"",
+    "test:unit": "cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 tests/unit/*.test.ts \"tests/unit/{api,auth,authz,build,cli,cli-helper,combo,compression,correctness,cors,db,db-adapters,docs,gamification,guardrails,lib,mcp,memory,runtime,security,services,settings,shared,translator,ui,usage}/**/*.test.ts\" \"tests/unit/**/*.test.mjs\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 \"tests/unit/dashboard/**/*.test.ts\" && npm run test:unit:serial",
     "test:unit:ci": "cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 tests/unit/*.test.ts \"tests/unit/{api,auth,authz,build,cli,cli-helper,combo,compression,correctness,cors,db,db-adapters,docs,gamification,guardrails,lib,mcp,memory,runtime,security,services,settings,shared,translator,ui,usage}/**/*.test.ts\" \"tests/unit/**/*.test.mjs\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 \"tests/unit/dashboard/**/*.test.ts\" && npm run test:unit:serial",
     "test:unit:ci:shard": "cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 --test-shard=$TEST_SHARD tests/unit/*.test.ts \"tests/unit/{api,auth,authz,build,cli,cli-helper,combo,compression,correctness,cors,db,db-adapters,docs,gamification,guardrails,lib,mcp,memory,runtime,security,services,settings,shared,translator,ui,usage}/**/*.test.ts\" \"tests/unit/**/*.test.mjs\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=4 --test-shard=$TEST_SHARD \"tests/unit/dashboard/**/*.test.ts\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-concurrency=1 --test-shard=$TEST_SHARD \"tests/unit/serial/**/*.test.ts\"",
     "test:unit:fast": "cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx/esm --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-isolation=none tests/unit/*.test.ts \"tests/unit/{api,auth,authz,build,cli,cli-helper,combo,compression,correctness,cors,db,db-adapters,docs,gamification,guardrails,lib,mcp,memory,runtime,security,services,settings,shared,translator,ui,usage}/**/*.test.ts\" \"tests/unit/**/*.test.mjs\" && cross-env DISABLE_SQLITE_AUTO_BACKUP=true node --max-old-space-size=8192 --import tsx --import ./open-sse/utils/setupPolyfill.ts --import ./tests/_setup/isolateDataDir.ts --test --test-force-exit --test-isolation=none \"tests/unit/dashboard/**/*.test.ts\" && npm run test:unit:serial",