Pure source rename: all 97 'sqlite3_* ... #foreign sqlib "csym";' fn decls → 'extern sqlib "csym";' (+ the one stale header-comment reference). The extern_lib axis references the 'sqlib' #import c unit identically to #foreign sqlib, so IR/output is byte-identical. Empty snapshot diff; example 1624 (vendor-sqlite-module) stdout byte-unchanged. Suite green (647 corpus / 444 unit, 0 failed).