Fix virtual method dispatch resolution

[dlunch]

Summary

• require the symbolic owner in Jvm::invoke_virtual and resolve methods before receiver selection
• preserve defining class loaders for runtime-package-aware public, protected, and package-private override checks
• pass constant-pool owners from invokevirtual, migrate host call sites, and correct affected runtime prototype access flags
• add a source-reproducible Java 8 dispatch fixture without adding marker tests under java_runtime/tests

Verification

• cargo test --workspace (546 passed, 1 ignored)
• cargo clippy --workspace --all-targets -- -D warnings
• cargo fmt --all -- --check
• git diff --check

Known limitations

• the name-only class registry still limits direct multi-loader identity fixtures
• linkage-error branches are implemented but do not use non-reproducible stale-binary fixtures

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[codecov]

Codecov Report

❌ Patch coverage is 92.42922% with 369 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.93%. Comparing base (95ebc5c) to head (47634dc).

Files with missing lines	Patch %	Lines
...e/src/classes/java/lang/abstract_string_builder.rs	23.33%	92 Missing ⚠️
...va_runtime/src/classes/java/text/decimal_format.rs	67.08%	26 Missing ⚠️
...me/src/classes/java/util/abstract_list_sub_list.rs	67.10%	25 Missing ⚠️
...va_runtime/src/classes/java/util/logging/logger.rs	71.76%	24 Missing ⚠️
java_runtime/src/classes/java/io/print_writer.rs	62.00%	19 Missing ⚠️
java_runtime/src/classes/java/util/abstract_map.rs	89.13%	15 Missing ⚠️
...classes/java/util/collections_unmodifiable_list.rs	50.00%	13 Missing ⚠️
...s/java/util/collections_unmodifiable_collection.rs	72.09%	12 Missing ⚠️
...ava_runtime/src/classes/java/lang/string_buffer.rs	92.80%	10 Missing ⚠️
...va_runtime/src/classes/java/util/hash_map_entry.rs	50.00%	10 Missing ⚠️
... and 42 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #201      +/-   ##
==========================================
+ Coverage   86.61%   86.93%   +0.32%     
==========================================
  Files         308      308              
  Lines       41539    44468    +2929     
==========================================
+ Hits        35979    38659    +2680     
- Misses       5560     5809     +249     

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