clang-tidy: scope the header filter to the object's own headers

The previous -header-filter='.*/source/projects/.*' also matched the bundled
CPython headers: the build includes them via a path that passes back through
source/projects (…/tap.python_tilde/../../../support/include/python3.13/…), so
the filter linted all of CPython and failed on its naming. (This slipped past
local checks because Ubuntu's clang-tidy canonicalizes the include path, hiding
the source/projects segment; the macOS CI clang-tidy keeps the literal path.)

Narrow the filter to '.*/tap\.python_tilde/tap\.python_tilde.*', which matches
only this object's own tap.python_tilde_*.h headers and excludes both the
CPython support tree and min-api. Verified against the exact CI path strings.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MRTDgYKY38WH8Bqz17W9k1

Author: tap

.github/workflows/style.yml

@@ -46,8 +46,13 @@ jobs:
           tidy="$(brew --prefix llvm@18)/bin/clang-tidy"
           files=$(python3 -c "import json; print('\n'.join(e['file'] for e in json.load(open('build/compile_commands.json')) if '/source/projects/' in e['file']))")
           fail=0
+          # Scope diagnostics to this object's OWN headers. A broad
+          # '.*/source/projects/.*' also matches the bundled CPython headers,
+          # which the build includes via a relative path that passes back
+          # through source/projects (…/tap.python_tilde/../../../support/…),
+          # flooding the run with CPython naming violations.
           for f in $files; do
-            out=$("$tidy" -p build -header-filter='.*/source/projects/.*' --warnings-as-errors='readability-*' "$f" 2>/dev/null || true)
+            out=$("$tidy" -p build -header-filter='.*/tap\.python_tilde/tap\.python_tilde.*' --warnings-as-errors='readability-*' "$f" 2>/dev/null || true)
             if echo "$out" | grep -qE "warning:|error:"; then echo "$out"; fail=1; fi
           done
           [ "$fail" -eq 0 ] && echo "clang-tidy clean." || { echo "::error::clang-tidy found violations"; exit 1; }