diff --git a/scripts/check-naming-and-style.sh b/scripts/check-naming-and-style.sh
index 4cad6abd..f357f65c 100755
--- a/scripts/check-naming-and-style.sh
+++ b/scripts/check-naming-and-style.sh
@@ -34,16 +34,51 @@ EXCLUDES=(
     --exclude-dir=bundle
     --exclude-dir=dist-subpath
     --exclude-dir=.git
+    # Visual Studio's local state, gitignored. CopilotSnapshots keeps a full
+    # per-edit copy of touched source files, so every real finding is reported
+    # again once per snapshot - hundreds of duplicates that bury the actual
+    # hits and make the scan take minutes instead of seconds.
+    --exclude-dir=.vs
     --exclude-dir=versions
     --exclude-dir=staticdocs
     # Local, gitignored scratch notes (see .gitignore devnotes/). Not product
     # source, never committed, and free to hold pasted logs full of em-dashes
     # and arrows - grep does not consult .gitignore, so exclude it explicitly.
     --exclude-dir=devnotes
-    --exclude=findings.sarif
-    --exclude=report.md
+    # .NET build output. The agent projects emit vendored runtime DLLs and
+    # generated *.nuget.g.props/.targets under bin/ and obj/; both are full of
+    # bytes nobody here wrote. Same failure as the .vs case above: thousands of
+    # hits that bury every real finding and make the gate unreadable, so it
+    # stops being run at all.
+    --exclude-dir=bin
+    --exclude-dir=obj
+    --exclude-dir=publish
+    --exclude-dir=dev-bin
+    # Data, not source: exported CSVs carry vendor mojibake and backups are
+    # snapshots of a moment. Neither is something a convention applies to.
+    --exclude-dir=exports
+    --exclude-dir=backups
 )
 
+# DO NOT ADD --exclude=<file> TO THE ARRAY ABOVE.
+#
+# In this grep build a single file-level --exclude silently CANCELS EVERY
+# --include filter on the same command. Bisected: with only --exclude-dir flags
+# a shorthand scan restricted to --include='*.py' returns 0 markdown hits; add
+# any one --exclude and the same scan returns 1142. Directory excludes are
+# unaffected - it is specifically the file form.
+#
+# This is not theoretical, it was live: --exclude=findings.sarif and
+# --exclude=report.md sat in this array and had been quietly disabling the
+# include lists for every check that used them. That is why the shorthand check
+# reported .md, .ps1, .cs, .json and .gitignore hits when its flags say it only
+# ever looks at .py/.vue/.js/.ts, and why the gate accumulated thousands of
+# unactionable findings that made it unreadable enough to be ignored.
+#
+# To skip a FILE, filter it out of the pipeline afterwards (see drop_scratch and
+# the post-filters on the ADR-015 check) or exclude the directory holding it.
+# Binaries are handled by grep -I on the scan itself.
+
 # Root-level gitignored scratch: review writeups and chat handoffs, free to hold
 # pasted logs full of em-dashes and arrows. grep does not consult .gitignore, so
 # it has to be dropped here.
@@ -54,6 +89,15 @@ EXCLUDES=(
 # that nothing would report. This drops only the path we mean.
 drop_scratch() { grep -v '^\./devnotes/' || true; }
 
+# Generated scan output, replacing the --exclude=findings.sarif and
+# --exclude=report.md that used to live in EXCLUDES. Same intent, but as a
+# post-filter, because the flag form cancelled every --include on the command
+# (see the warning above the EXCLUDES array). Also drops .env, which is local
+# configuration rather than source.
+drop_generated() {
+    grep -vP '^\./(.*/)?(findings\.sarif|report\.md|\.env):' || true
+}
+
 INCLUDES_CODE=(
     --include='*.py'
     --include='*.vue'
@@ -77,7 +121,11 @@ INCLUDES_ALL=(
 # and did, including in files this repo's own convention forbids them in.
 # Markdown, JSON and YAML are now covered too.
 echo "==> Checking for non-ASCII characters..."
-NON_ASCII=$(grep -rPn '[^\x00-\x7F]' "${EXCLUDES[@]}" "${INCLUDES_ALL[@]}" . 2>/dev/null | drop_scratch || true)
+# -I skips binary files. Without it grep reports "Binary file X matches" for any
+# archive or compiled artifact that slips past the excludes, which is noise no
+# author can act on: there is no line to fix. The excludes above are the primary
+# defence; this is the backstop for whatever they miss.
+NON_ASCII=$(grep -rPnI '[^\x00-\x7F]' "${EXCLUDES[@]}" "${INCLUDES_ALL[@]}" . 2>/dev/null | drop_scratch | drop_generated || true)
 if [ -n "$NON_ASCII" ]; then
     echo "FAIL: non-ASCII characters found (em-dashes, smart quotes, arrows, emojis):"
     echo "$NON_ASCII"
@@ -92,6 +140,8 @@ echo "==> Checking for banned shorthand (standalone)..."
 for word in cfg ctx mgr req res; do
     HITS=$(grep -rPn "(^|[^a-zA-Z0-9_])${word}([^a-zA-Z0-9_]|\$)" "${EXCLUDES[@]}" --include='*.py' --include='*.vue' --include='*.js' --include='*.ts' . 2>/dev/null \
         | grep -vP "(^|[^a-zA-Z0-9_])(request_obj|response_obj)" \
+        | drop_scratch \
+        | drop_generated \
         || true)
     if [ -n "$HITS" ]; then
         echo "FAIL: banned shorthand '$word' (standalone) found:"