byrongamatos 49da3022cf fix(career): path-traversal guard on prepare; a cap test that actually tests the cap
CodeRabbit again, and the first one is a real hole I put there.

1. PATH TRAVERSAL. sloppak.resolve_source_dir() does a bare `dlc_root / filename`
   with NO containment guard — so `../../x` walks straight out of the library, and
   my new endpoint handed it attacker-supplied filenames. Every filename now goes
   through _resolve_dlc_path first, the same check every other filename-bound
   handler applies. Pinned: `..`, backslash traversal, an absolute POSIX path and
   a Windows drive path are all refused, and nothing outside the library is
   unpacked.

2. THE CAP TEST WAS VACUOUS. It asserted `prepared == 0` against a fixture with no
   library — where the endpoint exits before extraction — so it passed whether or
   not MAX_GIG_SONGS existed. It now runs against a real library and asserts the
   endpoint CONSIDERED at most MAX_GIG_SONGS of the 82 it was handed. Verified to
   fail when the cap is removed.

   Same class of mistake as the notedetect gigBlock: a test that passes for the
   wrong reason. Worth saying out loud since it is twice in one day.

3. E702 — semicolon-joined statements in the new tests, split.

51 career tests; full suite green.
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