test(loader): cover LlamaLoader.resourceMatchesFile match + content-mismatch branches

[bernardladenthin]

Summary

Follow-up test coverage for the native-lib extraction race fix (#260). That PR added
LlamaLoader.resourceMatchesFile(...) — the fast-path reuse predicate that lets extraction reuse a
byte-identical existing copy instead of replacing a file a peer JVM may already have loaded — but
unit-tested only its absent-resource → false branch. This adds the two core branches:

• a present classpath resource vs a byte-identical on-disk copy → true (the reuse predicate itself), and
• a present resource whose on-disk copy diverges (one extra trailing byte) → false, so a stale/partial
  file is never mistaken for the shipped library on the reuse fast path.

Uses the committed src/test/resources/images/test-image.jpg classpath fixture; the tests are pure-Java
and need no model or native library. The @ClaudeGenerated class-purpose annotation is extended to mention
resourceMatchesFile.

The private extractFile / moveIntoPlace atomic-move + reuse flow stays covered end-to-end by
NativeLibraryLoadSmokeTest in the CI Java Tests jobs (which build the real native lib); it is not cleanly
unit-testable here without reflection.

Test plan

• mvn test -Dtest=LlamaLoaderTest → 25/25 green (was 23; +2 new branch tests).
• Spotless clean (mvn spotless:apply no-op after formatting).
• Test-only change — no production code touched; not in PIT scope, so the mutation gate is unaffected.

Notes for reviewer

Test-only, +38/−1 in a single file (LlamaLoaderTest.java). No public API or behavior change.

🤖 Generated with Claude Code

---

Generated by Claude Code