TON v2025.12

2025.12 Update

1. celldb-v2 enabled by default.
2. Fast state serializer (sharded serialization) enabled by default.
3. Using _ instead of : in package filenames for better compatibility with Windows and network protocols.
4. Introduced parallelism in the validator engine.
5. Added Python-based testing framework.
6. Various fixes in emulator, node, TVM, Asm.fif.
7. Introduced improved network traffic compression.
8. BLST updated.

Internal code changes:

1. Introduced support for coroutines in actors.
2. Enabled clang-format 21.
3. Removed the virtualization level concept.
4. Minor code style and cleanliness improvements.

Besides the work of the core team, this update also includes contributions from: @pyAndr3w (Asm.fif), @Gusarich (TVM fixes in arithops), @Kaladin13 (node fixes).