Chia-Network / chia_rs / 36195125301

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serde_2026 emission + trusted readers (minimal) (#1511)

* Emit serde_2026 generators; DAG-safe tree hashing for trusted reads

InternedBlockBuilder::finalize() now always emits the generator in
serde_2026 format (interned serialization, magic-prefixed); there is no
classic-emission mode, since cost accounting by interned vbytes and
serde_2026 acceptance both activate at the same height.

node_from_bytes_auto drops its max_blob_size parameter and cap: it's a
policy-free trusted reader (used by additions_and_removals and other
RPC-style reads of already-stored, already-validated blobs), not a
consensus entry point. The cost-derived size cap is enforced separately
by node_from_bytes_2026 on the consensus path. Because a policy-free
reader must accept whatever a backrefs/serde_2026 blob decodes to,
anything hashing its result needs to be DAG-aware (tree_hash_cached)
rather than the naive tree_hash walker, which can diverge exponentially
on crafted inputs; test_tree_hash_cached_deep_dag pins that property.

additions_and_removals switches from node_from_bytes_backrefs to
node_from_bytes_auto so it can read stored post-HF2 (serde_2026) blobs.

Co-authored-by: Cursor <cursoragent@cursor.com>

* wheel: trusted serde_2026 reads for tree_hash_auto and run_program

Adds tree_hash_auto(blob) -> bytes32: sniffs the encoding (classic,
backrefs, or serde_2026) via node_from_bytes_auto, then hashes with
tree_hash_cached. This is the DAG-safe hash trusted readers need to
compute the post-HF2 generator_root from unvalidated wire bytes.

run_chia_program, get_puzzle_and_solution_for_coin(2) switch from
node_from_bytes_backrefs to node_from_bytes_auto so they can also
accept stored serde_2026-encoded generators/puzzles/solutions.

Regenerates chia_rs.pyi via generate_type_stubs.py for the new stub.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Kill prefix-sniffing, add explicit-format serde_2026 API

Every chia-blockchain call site dispatches on block.version or f... (continued)

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