diff --git a/.github/workflows/shell.yml b/.github/workflows/shell.yml
index 78787a8..0010963 100644
--- a/.github/workflows/shell.yml
+++ b/.github/workflows/shell.yml
@@ -194,3 +194,39 @@ jobs:
       - uses: actions/checkout@v4
       - name: Run tests/claude-code-hook-scope.sh
         run: ./tests/claude-code-hook-scope.sh
+
+  # Suites that had no CI job until #335. Run as a matrix so adding a test is a
+  # one-line change and tests/ci-coverage.sh stays satisfied; invoked through
+  # `bash` because several of these files do not carry the executable bit.
+  suites:
+    name: ${{ matrix.test }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        test:
+          - agents-md-backup-retention
+          - carried-claude-code-plugin
+          - ci-coverage
+          - codex-runtime
+          - datamachine-worker
+          - detect-site-domain
+          - homeboy-codebox-canary
+          - homeboy-components
+          - homeboy-dmc-provider
+          - homeboy-project-id
+          - kimaki-launchd-start
+          - kimaki-managed-plugin-rig
+          - kimaki-multi-instance
+          - kimaki-system-message-patch
+          - opencode-claude-auth-refresh-hardening
+          - path-helpers
+          - post-upgrade-restore
+          - runtime-signature
+          - upgrade-opencode-auth-plugin-sync
+          - worktree-context-projections
+          - wp-config-permissions
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run tests/${{ matrix.test }}.sh
+        run: bash tests/${{ matrix.test }}.sh
diff --git a/bridges/kimaki.sh b/bridges/kimaki.sh
index ef669b5..1ed9e97 100644
--- a/bridges/kimaki.sh
+++ b/bridges/kimaki.sh
@@ -1190,6 +1190,19 @@ bridge_render_systemd() {
   local skill_filter_args
   skill_filter_args="$(_kimaki_skill_filter_args_shell)"
   _kimaki_validate_lock_port
+
+  # The lock port reaches the unit through Environment= rather than the
+  # --lock-port argument this used to append (#334). That moved a guarantee the
+  # RENDERER held unconditionally into data the CALLER supplies, so a caller
+  # that passes an env block without the line silently drops the port and the
+  # instance falls back to the default — two instances then fight over one lock.
+  # Re-assert it here, where it was always enforced.
+  if [ -n "${KIMAKI_LOCK_PORT:-}" ] && \
+     ! printf '%s\n' "$env_block" | grep -q '^Environment=KIMAKI_LOCK_PORT='; then
+    env_block="$env_block
+Environment=KIMAKI_LOCK_PORT=$KIMAKI_LOCK_PORT"
+  fi
+
   local stale_worker_cleanup="# User-wide stale-worker cleanup omitted for instance isolation."
   if [ "$unit" = "kimaki.service" ]; then
     stale_worker_cleanup='ExecStartPre=-/usr/bin/pkill -TERM -u '$SERVICE_USER' -f "opencode-ai/bin/.*serve"'
diff --git a/tests/ci-coverage.sh b/tests/ci-coverage.sh
new file mode 100755
index 0000000..9194904
--- /dev/null
+++ b/tests/ci-coverage.sh
@@ -0,0 +1,105 @@
+#!/bin/bash
+# tests/ci-coverage.sh — every test in tests/ is actually run by CI.
+#
+# WHY THIS EXISTS
+#
+# On 2026-08-05, 19 of 42 test files — nearly half the suite — were present in
+# the repo and referenced nowhere in .github/workflows/shell.yml. They were only
+# ever run by someone remembering to run them by hand.
+#
+# The consequence was not theoretical. #334 changed how the Kimaki lock port
+# reaches a systemd unit, updated tests/kimaki-multi-instance.sh to match,
+# merged with 20/20 checks green, and left that test failing on main — because
+# it was one of the 19. CI reported green over red, and the only reason anyone
+# noticed was an unrelated full-suite run.
+#
+# A workflow that lists jobs by hand fails this way silently and permanently: the
+# person adding a test is the same person who has to remember to wire it, and
+# nothing complains when they don't. This test makes the omission loud, which is
+# the only property that actually holds over time.
+#
+# It deliberately checks for the test NAME anywhere in the workflow rather than
+# an exact `./tests/<name>.sh` invocation, so a matrix entry, a composite job, or
+# a future restructuring all still satisfy it. The claim being made is "CI knows
+# about this file", not "CI invokes it in one particular way".
+set -eu
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$SCRIPT_DIR"
+
+WORKFLOW=".github/workflows/shell.yml"
+FAILED=0
+
+if [ ! -f "$WORKFLOW" ]; then
+  echo "  FAIL $WORKFLOW not found"
+  exit 1
+fi
+
+# Tests deliberately not wired into CI, each with the reason it cannot run there.
+# Adding a name here is a decision that should be visible in review; an empty
+# list is the healthy state.
+#
+#   (none)
+#
+EXCLUDED=""
+
+is_excluded() {
+  local name="$1" e
+  for e in $EXCLUDED; do
+    [ "$name" = "$e" ] && return 0
+  done
+  return 1
+}
+
+echo "ci-coverage: every tests/*.sh is referenced by $WORKFLOW"
+
+workflow_text="$(cat "$WORKFLOW")"
+missing=""
+
+for path in tests/*.sh; do
+  name="$(basename "$path" .sh)"
+  if is_excluded "$name"; then
+    echo "  skip $name (documented exclusion)"
+    continue
+  fi
+  case "$workflow_text" in
+    *"$name"*) ;;
+    *)
+      missing="$missing $name"
+      FAILED=$((FAILED + 1))
+      ;;
+  esac
+done
+
+if [ -n "$missing" ]; then
+  echo "  FAIL these tests exist but CI never runs them:"
+  for name in $missing; do
+    echo "         tests/$name.sh"
+  done
+  echo ""
+  echo "  Add a job to $WORKFLOW, or add the name to EXCLUDED in this file"
+  echo "  with the reason it cannot run in CI."
+else
+  echo "  ok   all $(ls tests/*.sh | wc -l | tr -d ' ') shell tests are referenced"
+fi
+
+# Non-shell suites are invoked directly by their own jobs; assert the two that
+# exist stay wired, since they are the easiest to lose in a restructure.
+for other in tests/dm-agent-sync.mjs tests/smoke-cli-transport.php; do
+  [ -e "$other" ] || continue
+  case "$workflow_text" in
+    *"$(basename "$other")"*) echo "  ok   $(basename "$other") is referenced" ;;
+    *)
+      echo "  FAIL $other exists but CI never runs it"
+      FAILED=$((FAILED + 1))
+      ;;
+  esac
+done
+
+echo ""
+if [ "$FAILED" -eq 0 ]; then
+  echo "ci-coverage: all assertions passed"
+else
+  echo "ci-coverage: $FAILED assertion(s) failed"
+  exit 1
+fi