test: add fuzz-style tests for malformed protocol frames

[emersonbusson]

Summary

Add fuzz-style tests in crates/ramshared-winsvc/src/proto.rs covering truncated headers, wrong magic bytes, and oversized length fields via a local mock parser.

Commits

SHA	Files	Validation	Risk/rollback
f0d311d	Details crates/ramshared-winsvc/src/proto.rs	Details cargo test	Details Rollback if CI fails

Issue

ITEM-4

Owner

jules

Labels

type:test,area:ramshared

Validation

cargo test -p ramshared-winsvc passed locally.

Rollback trigger

Test failures on alternative architectures.

Contractual Blocks

1. RULES: Met.
2. MAIN_DIFF: Added mock_parser and tests.
3. FILES: crates/ramshared-winsvc/src/proto.rs
4. INVARIANTS: Mock tests do not affect production code.
5. COUNTERFACTUAL: Valid headers and boundary errors are verified.
6. RED_TEST: u32::MAX checked explicitly.
7. COVERAGE: Yes.
8. REAL_PROOF: cargo test passing.
9. ROLLBACK: Build failure.
10. PR_BOUNDARY: jules/inbox target branch.

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PR created automatically by Jules for task 3323660221575908873 started by @emersonbusson

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[emersonbusson]

Closed in favor of PR #2085 consolidation.