diff --git a/.github/workflows/local-ci.yml b/.github/workflows/local-ci.yml
index 5c4368937..db7da6329 100644
--- a/.github/workflows/local-ci.yml
+++ b/.github/workflows/local-ci.yml
@@ -8,13 +8,15 @@
 #   push to main        -> affected ports only (scripts/ci-affected-ports.sh)
 #   nightly + dispatch  -> full matrix
 #
-# Java is split into two parallel jobs — java-fast (java+kotlin conformance, the
-# quick correctness signal ~2-3m) and java-slow (full reactor + docker
-# integration). The split surfaces the conformance verdict fast and means a
-# cancel/OOM mid-integration no longer kills the fast signal. `detect` emits the
-# umbrella token `java`; both jobs gate on it.
+# The ts and java ports are each split into two parallel jobs — a FAST lane (the
+# quick pure-code correctness signal: ts-fast = build+typecheck/conformance/
+# completeness, java-fast = java+kotlin conformance) and a SLOW lane (docker
+# integration + heavy build: ts-slow, java-slow = reactor + integration). The
+# split surfaces the verdict fast and means a cancel/OOM/flake mid-integration no
+# longer kills the fast signal. `detect` emits the umbrella token (`ts` / `java`);
+# both of that port's jobs gate on it.
 #
-# Integration-running jobs (ts, python, csharp, java-slow) share a Postgres
+# Integration-running jobs (ts-slow, python, csharp, java-slow) share a Postgres
 # SIDECAR instead of each test booting its own Testcontainers Postgres per
 # scenario (the java+kotlin lanes alone booted ~30-40 serial containers). Each
 # port's PG helper honors METAOBJECTS_TEST_PG_URL and CREATEs a uniquely-named
@@ -77,7 +79,22 @@ jobs:
           persist-credentials: false
       - run: scripts/ci-local.sh --only gates --strict-toolchains
 
-  ts:
+  # TS FAST lane — build+typecheck, conformance, completeness (the pure-code
+  # correctness signal). No docker/integration, so no sidecar.
+  ts-fast:
+    needs: detect
+    if: contains(needs.detect.outputs.ports, 'ts')
+    runs-on: [self-hosted, linux]
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - run: scripts/ci-local.sh --only ts-fast --strict-toolchains
+
+  # TS SLOW lane — build + docker/sidecar integration tests. Uses the shared
+  # Postgres sidecar (dynamic host port; see the note above the integration jobs).
+  ts-slow:
     needs: detect
     if: contains(needs.detect.outputs.ports, 'ts')
     runs-on: [self-hosted, linux]
@@ -102,7 +119,7 @@ jobs:
           persist-credentials: false
       - env:
           METAOBJECTS_TEST_PG_URL: postgres://metaobjects:metaobjects@localhost:${{ job.services.postgres.ports['5432'] }}/metaobjects_test
-        run: scripts/ci-local.sh --only ts --strict-toolchains
+        run: scripts/ci-local.sh --only ts-slow --strict-toolchains
 
   # Java FAST lane — java + kotlin conformance only (the quick correctness signal).
   # No docker/integration, so no sidecar.
@@ -201,7 +218,7 @@ jobs:
         run: scripts/ci-local.sh --only csharp --strict-toolchains
 
   notify:
-    needs: [detect, gates, ts, java-fast, java-slow, python, csharp]
+    needs: [detect, gates, ts-fast, ts-slow, java-fast, java-slow, python, csharp]
     if: always() && contains(needs.*.result, 'failure')
     runs-on: [self-hosted, linux]
     steps:
diff --git a/scripts/ci-local.sh b/scripts/ci-local.sh
index e52e9a78f..b63a37786 100755
--- a/scripts/ci-local.sh
+++ b/scripts/ci-local.sh
@@ -26,6 +26,11 @@
 #                                    #            doc-template drift, embedded-library drift
 #                                    #   ts     → ts build+typecheck, ts conformance,
 #                                    #            completeness-gate, integration-tests ts
+#                                    #   ts-fast → build+typecheck, conformance,
+#                                    #            completeness (the pure-code signal)
+#                                    #   ts-slow → build + integration-tests ts
+#                                    #            (docker); CI runs the two lanes as
+#                                    #            separate parallel jobs
 #                                    #   java   → java+kotlin conformance, reactor,
 #                                    #            integration-tests java+kotlin
 #                                    #   java-fast → java+kotlin conformance only
@@ -64,8 +69,8 @@ while [ $# -gt 0 ]; do
     --quick) QUICK=1 ;;
     --strict-toolchains) STRICT=1 ;;
     --only) shift; case "${1:-}" in
-        gates|ts|java|java-fast|java-slow|python|csharp) ONLY="$ONLY ${1}" ;;
-        *) echo "--only expects gates|ts|java|java-fast|java-slow|python|csharp, got '${1:-}'" >&2; exit 2 ;;
+        gates|ts|ts-fast|ts-slow|java|java-fast|java-slow|python|csharp) ONLY="$ONLY ${1}" ;;
+        *) echo "--only expects gates|ts|ts-fast|ts-slow|java|java-fast|java-slow|python|csharp, got '${1:-}'" >&2; exit 2 ;;
       esac ;;
     -h|--help) awk 'NR==1{next} /^set -uo/{exit} {sub(/^# ?/,""); print}' "$0"; exit 0 ;;
     *) echo "unknown arg: $1 (see --help)" >&2; exit 2 ;;
@@ -125,6 +130,9 @@ gate_fixture_lint() {
 # bun_install first: under `--only ts` this gate runs without fixture-lint
 # (whose install it historically piggybacked on), so it must install itself.
 gate_ts_build_typecheck() { bun_install && bun run --filter '*' build && bun run --filter '*' typecheck; }
+# Build only (no typecheck) — the ts-slow lane needs the workspace dist/ to run the
+# integration tests, but the typecheck already runs in ts-fast, so don't repeat it.
+gate_ts_build() { bun_install && bun run --filter '*' build; }
 
 # ── conformance.yml — per-port conformance corpora (exact CI commands) ────────
 gate_conf_ts() {
@@ -232,9 +240,15 @@ fi
 if want gates; then step    "leak-scan (security)"             gate_leak_scan;             fi
 if want gates; then step    "pom-version parity"               gate_pom_versions;           fi
 if want gates; then step_if bun "fixture-lint"                 gate_fixture_lint;           fi
-if want ts;    then step_if bun "ts build + typecheck"         gate_ts_build_typecheck;     fi
-if want ts;    then step_if bun "conformance: typescript"      gate_conf_ts;                fi
-if want ts;    then step_if bun "completeness-gate (mutation)" gate_completeness;           fi
+# The ts port is split into two lanes so CI can run them as separate jobs (see
+# .github/workflows/local-ci.yml): a FAST lane (build+typecheck, conformance,
+# completeness — the pure-code correctness signal, no docker) and a SLOW lane
+# (docker/sidecar integration). Isolating integration means a docker/sidecar
+# hiccup no longer fails the code signal, and vice versa. `--only ts` (and a plain
+# local run) still runs both lanes, so it stays byte-equivalent to before.
+if want_any ts ts-fast; then step_if bun "ts build + typecheck"         gate_ts_build_typecheck;     fi
+if want_any ts ts-fast; then step_if bun "conformance: typescript"      gate_conf_ts;                fi
+if want_any ts ts-fast; then step_if bun "completeness-gate (mutation)" gate_completeness;           fi
 if want gates; then step_if bun "doc-template drift"           gate_doc_template_drift;     fi
 if want gates; then step_if bun "embedded-library drift"       gate_embedded_library_drift; fi
 
@@ -270,7 +284,11 @@ else
       FAIL+=("integration-tests (docker down)")
     fi
   else
-    want ts                    && run_integration_for ts     ts
+    # ts-slow needs the workspace dist/ to run integration. When the fast lane also
+    # runs (umbrella `ts` / local full), its build already produced it — only build
+    # here when ts-slow runs in isolation (the CI ts-slow job).
+    if want_any ts ts-slow && ! want_any ts ts-fast; then step_if bun "ts build (for integration)" gate_ts_build; fi
+    want_any ts ts-slow        && run_integration_for ts     ts
     want_any java java-slow    && run_integration_for java   java kotlin
     want python                && run_integration_for python python
     want csharp                && run_integration_for csharp csharp