v0.5.3

Performance

• Pre-compile regex patterns — Module-level compiled constants in vm_manager and package_validator (pattern compiled once at import, not per call)
• Cache TypeAdapter in guest_channel — StreamingMessage TypeAdapter built once at module level instead of per message. Eliminates 1000+ instantiations and 2 string allocations per message in the hot path

Build

• Flamegraph profiling — New make test-flamegraph / make bench-flamegraph targets using py-spy in speedscope format

Full Changelog: v0.5.2...v0.5.3