Decide the Pascal-import namespace for C packages (uses zlib collision)

• Type: decision + small feature (compiler uses resolution + lib/clib layout). Track C (frontend surface) — needs a user decision first.
• Split 2026-07-08 out of [[feature-c-runtime-library]] when that umbrella resolved (crtl substrate + autopull long since live; this was its one open design question, deliberately deferred there since 2026-06-20).

Problem (unchanged from the umbrella)

Direct Pascal import of C packages is wanted; Pascal wrappers stay optional.

• uses zlib as a Pascal wrapper vs. uses zlib as a direct C package collide.
• uses c/zlib is clear but not Pascal-compatible syntax.
• uses zlib.h-shaped imports bind the language surface to filenames.

Also still open: the lib/clib/<package>/ layout (metadata, include/, src/) has no instance yet — zlib/sqlite/tcc/cjson all live in gitignored library_candidates/ as corpus, not as importable packages.

Ask

User picks the namespace shape; then implement resolution in the frontend and promote the first real package (zlib is the natural candidate — it already builds byte-identical to gcc) into lib/clib/ as the reference layout.