fix(plugin): preserve declarations around C++ raw strings

[WenJing95]

Summary

C++ raw strings can contain quotes and braces that currently confuse source previews, hiding real declarations or showing functions written inside strings. Recognize these literals so previews retain the surrounding code.

Changes

• Match C++ raw-string prefixes and custom delimiters, then reuse the existing raw-terminator handling.
• Require an opener boundary so a macro such as ERROR immediately before a quoted string is not mistaken for a raw literal. Cover ASCII and Unicode macro names.
• Exercise source/header suffixes, encoding prefixes, multiline bodies, and rank-input generation.

Testing

• python -m pytest -q plugins/codex-security/tests/test_rank_preview.py plugins/codex-security/tests/test_generate_rank_input.py: 212 passed.
• Plugin Ruff lint and format checks passed.
• pnpm --dir sdk/typescript run build:ci passed.
• Plugin source compatibility checker and its 9 tests passed.
• Compiled macro-boundary examples with GCC and Clang; confirmed the original patch hides the following function and the corrected patch preserves it.
• git diff --check passed. Source-checker tests used NODE_NO_WARNINGS=1 to suppress the local Node proxy warning.

Risk and rollout

Limited to source-preview masking for C++ and Objective-C++ file suffixes, including shared headers. Uses the existing masking state and preserves line positions. No public CLI changes.

Public disclosure review

• No customer, partner, prospect, or user identities, data, or identifying details are included.
• No credentials, personal data, private source, scan findings, or nonpublic links or tickets are included.
• I reviewed the branch name, title, description, commits, changes, comments, logs, screenshots, attachments, and links for public disclosure.

[mldangelo-oai]

Thanks for finding this. I reproduced the missing declarations, and reusing the existing raw-string handling keeps the fix small.

I added one boundary correction: a macro such as ERROR followed immediately by a string was being mistaken for a raw-string opener, hiding the next function. The regression tests now cover that, including Unicode identifiers, and I removed a redundant assertion.

The 212 focused tests and all portable source checks pass. This is a useful correction to the previews and looks good to merge once CI is green.