fix(elisp): exclude generated package files from coverage source scan

cj/coverage-summary--source-files scanned SOURCE-DIR for *.el and treated every match as testable source. Build tools write NAME-autoloads.el and NAME-pkg.el into that dir, and undercover never instruments them, so the missing-file detection counted each as untested at 0% and dragged the file-weighted project number down. emacs-wttrin read 72.9% instead of 97.2% after eask wrote its autoloads file during a coverage run.

seq-remove the generated files before returning. A genuinely untested source is still flagged. The new test asserts both.

2 files changed, 25 insertions, 3 deletions

diff --git a/languages/elisp/claude/scripts/coverage-summary.el b/languages/elisp/claude/scripts/coverage-summary.el
index eb30c66..4b7f5c9 100644
--- a/languages/elisp/claude/scripts/coverage-summary.el
+++ b/languages/elisp/claude/scripts/coverage-summary.el
@@ -91,11 +91,15 @@ missing or malformed."
 
 (defun cj/coverage-summary--source-files (source-dir project-root)
   "Return *.el files directly under SOURCE-DIR, relative to PROJECT-ROOT.
-Sorted; compiled files and subdirectories are out of scope."
+Sorted.  Compiled files and subdirectories are out of scope, as are generated
+package files (`*-autoloads.el', `*-pkg.el') -- a build tool writes those, no
+test covers them, and counting them as untested source skews the number."
   (let ((source-dir (file-name-as-directory (expand-file-name source-dir)))
         (project-root (file-name-as-directory (expand-file-name project-root))))
-    (sort (mapcar (lambda (p) (file-relative-name p project-root))
-                  (directory-files source-dir t "\\.el\\'"))
+    (sort (seq-remove
+           (lambda (p) (string-match-p "\\(?:-autoloads\\|-pkg\\)\\.el\\'" p))
+           (mapcar (lambda (p) (file-relative-name p project-root))
+                   (directory-files source-dir t "\\.el\\'")))
           #'string<)))
 
 (defun cj/coverage-summary--missing (tracked source-dir project-root)
diff --git a/languages/elisp/tests/test-coverage-summary.el b/languages/elisp/tests/test-coverage-summary.el
index 5be03b3..ed3a6a0 100644
--- a/languages/elisp/tests/test-coverage-summary.el
+++ b/languages/elisp/tests/test-coverage-summary.el
@@ -135,6 +135,24 @@ is a JSON array string like \"[1, 0, null]\"."
            (missing (cj/coverage-summary--missing tracked src root)))
       (should (null missing)))))
 
+(ert-deftest cs-missing-excludes-generated-package-files ()
+  "Generated -autoloads.el / -pkg.el are not source, so a build tool writing
+them does not drag the number down; a genuinely untested source is still
+flagged (the filter is not over-broad)."
+  (cs-test--with-project
+      (list :sources '(("real.el" . ";; r") ("untested.el" . ";; u")
+                       ("proj-autoloads.el" . ";; gen")
+                       ("proj-pkg.el" . ";; gen"))
+            :report (cs-test--report '(("real.el" . "[1, 1]"))))
+    (let* ((table (cj/coverage-summary--under-dir
+                   (cj/coverage-summary--parse-file report) src root))
+           (tracked (let (ks) (maphash (lambda (k _v) (push k ks)) table) ks))
+           (missing (mapcar #'file-name-nondirectory
+                            (cj/coverage-summary--missing tracked src root))))
+      (should (member "untested.el" missing))
+      (should-not (member "proj-autoloads.el" missing))
+      (should-not (member "proj-pkg.el" missing)))))
+
 ;; --- project number (unit-weighted, missing as 0%) -------------------------
 
 (ert-deftest cs-project-pct-unit-weighted-with-missing-as-zero ()