feat(runtime): add promise_yield_create2 host function

[graphite]

Summary

• Add new promise_yield_create2 host function that allows contracts to provide a custom 32-byte yield ID and timeout when creating yield/resume promises
• Store bidirectional yield_id ↔ data_id mappings in the trie for duplicate detection and cleanup on resume/timeout
• Gate behind YieldCreate2 nightly protocol feature (version 153)

Motivation

The current promise_yield_create returns a runtime-generated data_id that contracts must store in state to later call promise_yield_resume. For use cases like in-contract mempools (NEP-0616 wallet extensions, Aurora), this storage cost is prohibitive. promise_yield_create2 lets contracts provide their own deterministic yield ID, avoiding expensive storage.

Context: https://near.zulipchat.com/#narrow/channel/295558-core/topic/yield_create2

Host function signature

promise_yield_create2(
    method_name_len, method_name_ptr,
    arguments_len, arguments_ptr,
    gas, gas_weight,
    yield_id_len, yield_id_ptr,     // user-provided 32-byte yield ID
    yield_timeout_blocks,            // custom timeout (only 200 accepted for now)
    register_id                      // data_id written here
) -> u64  // promise index

Key design decisions

• data_id generation: Normal generate_data_id(), not derived from yield_id
• Trie mappings: YieldIdToDataId and DataIdToYieldId for duplicate detection and cleanup
• Duplicate detection: Errors with YieldIdAlreadyExists if yield_id is already pending
• Timeout: Only 200 blocks accepted for now; will be expanded later
• Compatible with existing promise_yield_resume — data_id written to register

Test plan

• Existing yield/resume integration tests pass (stable)
• New create2_then_resume nightly test passes
• New create2_and_resume_in_one_call nightly test passes
• Parameter snapshot tests updated and passing
• cargo check with nightly features passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 69.49153% with 108 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.40%. Comparing base (c21dadb) to head (8a4d808).

Files with missing lines	Patch %	Lines
runtime/near-vm-runner/src/logic/logic.rs	0.00%	68 Missing ⚠️
...untime/near-vm-runner/src/wasmtime_runner/logic.rs	85.71%	0 Missing and 14 partials ⚠️
core/store/src/utils/mod.rs	86.00%	7 Missing ⚠️
...me/near-vm-runner/src/logic/mocks/mock_external.rs	66.66%	5 Missing and 1 partial ⚠️
runtime/near-vm-runner/src/logic/errors.rs	0.00%	3 Missing ⚠️
runtime/runtime/src/ext.rs	92.50%	1 Missing and 2 partials ⚠️
core/primitives/src/trie_key.rs	91.66%	2 Missing ⚠️
core/primitives/src/types.rs	0.00%	2 Missing ⚠️
core/parameters/src/parameter_table.rs	0.00%	0 Missing and 1 partial ⚠️
core/parameters/src/view.rs	50.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #15602      +/-   ##
==========================================
+ Coverage   69.38%   69.40%   +0.01%     
==========================================
  Files         940      940              
  Lines      212231   212583     +352     
  Branches   212231   212583     +352     
==========================================
+ Hits       147252   147536     +284     
- Misses      59125    59173      +48     
- Partials     5854     5874      +20     

Flag	Coverage Δ
pytests-nightly	1.14% <0.00%> (-0.01%)	⬇️
unittests	68.69% <7.06%> (-0.08%)	⬇️
unittests-nightly	68.94% <69.20%> (+0.01%)	⬆️

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