feat(speculation): standard composed speculator - #451
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## Summary ### Why? The Generator ranks and the Allocator spends; something must compose them into the Speculator extension the orchestrator calls. ### What? Adds `speculator/standard`. It funds the queue's most promising paths first until the build budget is spent: candidates considered in descending likelihood, in-flight paths kept funded rather than restarted, finished paths never re-proposed. Pairing bestfirst with sticky yields the default speculation policy; changing either behavior means swapping a part, not writing a new Speculator. standard adds no cancellation handling of its own and inherits it from the two parts; a test pins that a cancelled run yields the context error and no actions. Behavior is documented in `standard/README.md`; the speculator README keeps only the extension contract. ## Test Plan ✅ `bazel test //submitqueue/extension/speculation/...` ✅ `make fmt`, `make gazelle`, `make mocks`
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Summary
Why?
The Generator ranks and the Allocator spends; something must compose them into the Speculator extension the orchestrator calls.
What?
Adds
speculator/standard. It funds the queue's most promising paths first until the build budget is spent: candidates considered in descending likelihood, in-flight paths kept funded rather than restarted, finished paths never re-proposed. Pairing bestfirst with sticky yields the default speculation policy; changing either behavior means swapping a part, not writing a new Speculator.standard adds no cancellation handling of its own and inherits it from the two parts; a test pins that a cancelled run yields the context error and no actions. Behavior is documented in
standard/README.md; the speculator README keeps only the extension contract.Test Plan
✅
bazel test //submitqueue/extension/speculation/...✅
make fmt,make gazelle,make mocksIssues