DEVX-147: fix: increase CI_SCALE_FACTOR default from 4 to 6

Co-authored-by: kireto <kireto@oblachno.com>

src/devx/tools/check_test_speed.py

@@ -14,11 +14,11 @@ total wall-clock time and individual test durations are parsed and validated.
 
 CI runner scaling
 -----------------
-CI runners (Gitea Actions Docker containers) are typically 3-4x slower than
+CI runners (Gitea Actions Docker containers) are typically 5-8x slower than
 local development machines due to shared CPU, fewer cores, and container
 overhead.  When the ``CI`` environment variable is set (standard CI
 convention), both the total and per-test limits are multiplied by
-``CI_SCALE_FACTOR`` (default 4) to account for this.  This keeps the local
+``CI_SCALE_FACTOR`` (default 6) to account for this.  This keeps the local
 budget strict while preventing false failures on slower CI runners.
 
 The scale factor can be overridden via the ``DEVX_CI_SCALE_FACTOR``
@@ -39,10 +39,10 @@ DEFAULT_MAX_SECONDS = 10.0
 DEFAULT_MAX_SINGLE_SECONDS = 0.5
 TEST_COMMAND = ["make", "test-unit"]
 
-# CI runners are typically 3-4x slower than local machines (shared CPU,
+# CI runners are typically 5-8x slower than local machines (shared CPU,
 # fewer cores, container overhead).  Scale limits up when running on CI
 # so the gate catches real regressions, not infrastructure slowness.
-CI_SCALE_FACTOR = float(os.environ.get("DEVX_CI_SCALE_FACTOR", "4"))
+CI_SCALE_FACTOR = float(os.environ.get("DEVX_CI_SCALE_FACTOR", "6"))
 _IS_CI = bool(os.environ.get("CI") or os.environ.get("GITEA_ACTIONS"))
 
 # Matches pytest summary line: "234 passed in 0.70s"