Description:

The s_copyright script previously used find [a-z]* to search all lowercase top-level directories and then relied on sed filters to exclude generated/build directories (build/, cmake/, venv/). This opt-out approach means new build or third-party directories added in the future could silently be scanned unless a corresponding exclusion is remembered and added.

Change:

Replace the broad find [a-z]* glob with an explicit list of known source directories: bench, dist, docs, examples, ext, lang, oss, src, test, tools

Remove the now-redundant sed exclusions for ^build/, ^cmake/, and ^venv/ since those directories are no longer in the search path.

Motivation:

• Makes the intent of the script self-documenting — it is immediately clear which directories are subject to copyright checking.
• New build artifacts or tool-generated directories won't be accidentally scanned.
• Reduces the chance of false positives or unnecessary failures in non-standard build setups (e.g., cbuild/, alternate CMake output dirs).

Testing:

Run dist/s_copyright from the repo root and verify it reports the same set of copyright violations as before with no new errors introduced by the directory change.