fix(ci): adjust for mirror=auto default; don't force verbose in e2e-suite jobs

Follow-up to the mirror=auto fix and MCPP_VERBOSE rollout, fixing 3 e2e
regressions surfaced by the previous CI run (75 itself now PASSES):

- 38_self_config_mirror.sh: the default seed is now "auto" (defer to xlings'
  region detection), not "CN". Updated the assertion; explicit --mirror
  GLOBAL/cn/BAD checks unchanged.
- 48_build_error_output.sh / 53_namespaced_cache_label.sh assert mcpp's DEFAULT
  (quiet) output. Forcing MCPP_VERBOSE=1 in CI broke them. Removed MCPP_VERBOSE
  from the workflows that run the e2e suite (ci-linux-e2e, ci-macos, ci-windows);
  kept it where it's diagnostic and safe (ci-fresh-install,
  ci-aarch64-fresh-install — the cold bootstrap path — plus ci-linux unit tests
  and cross-build). A test that needs verbose passes --verbose itself.

Verified locally: 38/48/53 green.

Author: Sunrisepeak

.github/workflows/ci-linux-e2e.yml

@@ -28,10 +28,11 @@ jobs:
     timeout-minutes: 45
     env:
       MCPP_HOME: /home/runner/.mcpp
-      # Verbose every mcpp invocation (incl. those nested in e2e scripts) so CI
-      # logs carry full diagnostics for failures like a cold index/sandbox
-      # bootstrap. Honoured via the MCPP_VERBOSE override in src/cli.cppm.
-      MCPP_VERBOSE: "1"
+      # NOTE: do NOT force MCPP_VERBOSE here. The e2e suite includes tests that
+      # assert mcpp's DEFAULT (quiet) output — e.g. 48_build_error_output and
+      # 53_namespaced_cache_label — which forced verbose would break. Verbose is
+      # set only in the fresh-install workflows (cold bootstrap, no such asserts).
+      # A specific test that needs verbose passes `--verbose` itself.
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/ci-macos.yml

@@ -19,9 +19,9 @@ jobs:
     name: macOS ARM64 — xlings LLVM end-to-end
     runs-on: macos-15
     timeout-minutes: 30
-    env:
-      # Verbose every mcpp invocation for richer CI diagnostics (src/cli.cppm).
-      MCPP_VERBOSE: "1"
+    # NOTE: no MCPP_VERBOSE here — this job runs the e2e suite, which includes
+    # tests asserting mcpp's default quiet output (48/53). Verbose is forced only
+    # in the fresh-install workflows.
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/ci-windows.yml

@@ -21,8 +21,8 @@ jobs:
     timeout-minutes: 45
     env:
       MCPP_HOME: C:\Users\runneradmin\.mcpp
-      # Verbose every mcpp invocation for richer CI diagnostics (src/cli.cppm).
-      MCPP_VERBOSE: "1"
+      # NOTE: no MCPP_VERBOSE — this job runs the e2e suite, which asserts mcpp's
+      # default quiet output (48/53). Verbose is forced only in fresh-install.
     steps:
       - uses: actions/checkout@v4
 

tests/e2e/38_self_config_mirror.sh

@@ -14,9 +14,13 @@ source "$(dirname "$0")/_inherit_toolchain.sh"
     exit 1
 }
 
-grep -q '"mirror": "CN"' "$MCPP_HOME/registry/.xlings.json" || {
+# Default (no explicit --mirror): mcpp seeds "auto" so xlings' own region
+# detection (probe github vs gitcode) picks the reachable/faster mirror, instead
+# of mcpp hardcoding one. An explicit `mcpp self config --mirror X` still pins a
+# concrete value (asserted below).
+grep -q '"mirror": "auto"' "$MCPP_HOME/registry/.xlings.json" || {
     cat "$MCPP_HOME/registry/.xlings.json"
-    echo "FAIL: default mirror should be CN"
+    echo "FAIL: default mirror should be auto (defer to xlings region detection)"
     exit 1
 }