feat: retain active macOS Node compile caches

[seonghobae]

Summary

• recognize only the exact per-user macOS Node compile-cache root as regenerable
• preserve it while any bounded Node runtime observation is active or incomplete
• recheck activity before and after hashing and immediately before removal
• provide action-oriented customer guidance separately from audit blocker codes

Live audit evidence

• observed allocation: 1,276,768 KiB across 136,833 files
• newest content timestamp advanced during the bounded observation
• Node and MCP runtimes were active, so DiskSage preserved the cache
• no removal or provider-data mutation was performed

Validation

• git diff --check
• focused cold Rust build was stopped when it began increasing disk pressure; generated target artifacts were removed immediately
• exact contract, bounded parser, and customer-copy unit coverage added for hosted validation

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