P3-29 Centralize BVM parsing/writing shared C++ module

[Kinin-Code-Offical]

(Synced from docs/current_status/issue_ready_backlog.md)\n\n# P3-29 Centralize BVM parsing/writing shared C++ module\n\nSummary

• Area: firmware artifact
• Deliverable: one implementation used by FirmwareEngine + NativeEngine.

Acceptance Criteria

• One shared BVM library exists.
• FirmwareEngine and NativeEngine both use it.

Test Plan

• Round-trip tests on sample BVM artifacts.

Likely File Targets

• FirmwareEngine + NativeEngine BVM handling code

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[github-actions]

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