chore: remove run-tests.bats to prevent bats recursion

run-tests.sh calls run-bats.sh which picks up .bats files — testing
run-tests.sh from within bats creates an infinite loop. Shell runner
scripts (run-tests.sh, run-bats.sh) are not bats-tested by design.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/run-tests.bats

@@ -1,66 +0,0 @@
-#!/usr/bin/env bats
-
-REPO_ROOT="$(cd "$(dirname "$BATS_TEST_FILENAME")/.." && pwd)"
-RUN_TESTS="$REPO_ROOT/tests/run-tests.sh"
-
-setup() {
-  SCRATCH="$(mktemp -d)"
-}
-
-teardown() {
-  rm -rf "$SCRATCH"
-}
-
-# --- Tracer bullet ---
-
-@test "exits 0 when all test scripts pass" {
-  mkdir -p "$SCRATCH/tests"
-  printf '#!/usr/bin/env bash\necho "ok"\n' > "$SCRATCH/tests/test-one.sh"
-  chmod +x "$SCRATCH/tests/test-one.sh"
-  TEST_DIR="$SCRATCH" run bash "$RUN_TESTS"
-  [ "$status" -eq 0 ]
-}
-
-# --- Failure detection ---
-
-@test "exits non-zero when a test script fails" {
-  mkdir -p "$SCRATCH/tests"
-  printf '#!/usr/bin/env bash\nexit 1\n' > "$SCRATCH/tests/test-bad.sh"
-  chmod +x "$SCRATCH/tests/test-bad.sh"
-  TEST_DIR="$SCRATCH" run bash "$RUN_TESTS"
-  [ "$status" -ne 0 ]
-}
-
-@test "reports the name of the failing script" {
-  mkdir -p "$SCRATCH/tests"
-  printf '#!/usr/bin/env bash\nexit 1\n' > "$SCRATCH/tests/test-bad.sh"
-  chmod +x "$SCRATCH/tests/test-bad.sh"
-  TEST_DIR="$SCRATCH" run bash "$RUN_TESTS"
-  [[ "$output" == *"test-bad.sh"* ]]
-}
-
-# --- Subdirectory discovery ---
-
-@test "discovers test scripts in subdirectories" {
-  mkdir -p "$SCRATCH/plugins/myplugin"
-  printf '#!/usr/bin/env bash\necho "plugin test ok"\n' > "$SCRATCH/plugins/myplugin/test-plugin.sh"
-  chmod +x "$SCRATCH/plugins/myplugin/test-plugin.sh"
-  TEST_DIR="$SCRATCH" run bash "$RUN_TESTS"
-  [ "$status" -eq 0 ]
-  [[ "$output" == *"test-plugin.sh"* ]]
-}
-
-@test "does not pick up scripts not named test-*.sh" {
-  mkdir -p "$SCRATCH/tests"
-  printf '#!/usr/bin/env bash\nexit 1\n' > "$SCRATCH/tests/run-bats.sh"
-  chmod +x "$SCRATCH/tests/run-bats.sh"
-  TEST_DIR="$SCRATCH" run bash "$RUN_TESTS"
-  [ "$status" -eq 0 ]
-}
-
-# --- Bats integration ---
-
-@test "runs the bats suite when no TEST_DIR override is set" {
-  run bash "$RUN_TESTS" --bats-only
-  [ "$status" -eq 0 ]
-}