feat(speculation): add enumerator + dependency-limit extensions#315
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## Summary
Reshape the speculation tree data model around the Base/Head path that
the build stage actually consumes, and align its store with the
speculation design.
entity: SpeculationPath{Base, Head} becomes the unit;
SpeculationPathInfo carries the path plus its Score, controller-owned
Status
(candidate/selected/prioritized/building/passed/failed/cancelling/cancelled),
and BuildID — Path is immutable once persisted, Score/Status/BuildID are
updateable by the controller. Score is scorer-computed and
controller-persisted dynamic state — recomputed on every respeculate,
not set at enumeration. Selected/Prioritized and Cancelling/Cancelled
split desire vs budget-cleared and cancel-intent vs terminal, so the
persisted status carries the cross-stage contract. Adds
SpeculationPathAction (Promote/Cancel) and SpeculationPathDecision for
the selector and prioritizer seams. SpeculationTree.Speculations becomes
Paths, and the tree gains a Version for optimistic locking (starts at 1,
incremented per change). The Build entity uses the shared
SpeculationPath (Head = the batch under verification) and drops its own
Score, which was never populated or read.
storage: SpeculationTreeStore.UpdateSpeculations(batchID,
[]SpeculationInfo) becomes a pure conditional write — Update(ctx,
batchID, oldVersion, newVersion, paths) — returning ErrVersionMismatch
when the persisted version does not match, per the repo's
optimistic-locking pattern (version arithmetic owned by the controller).
The MySQL impl treats rowsAffected == 1 as success, 0 as version
mismatch, and anything else as a generic error. The MySQL column
speculations is renamed paths and the schema gains a version column.
MySQL impl, mock, and storage integration coverage (create/get
round-trip, duplicate, versioned whole-tree overwrite, stale-write
rejection, not-found) added/updated.
## Test Plan
## Issues
## Stack
1. @ #231
1. #315
1. #316
1. #317
1. #320
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Add the first speculation seam and its limit counterpart from the speculation RFC, as vendor-agnostic extension interfaces under submitqueue/extension/speculation/. enumerator: given a batch and its active dependencies ordered oldest-first (queue arrival order — the ordering that fixes which assumed-good Base prefixes exist), mechanically lists the candidate Base/Head speculation paths — pure, deterministic, and purely structural. It returns only []entity.SpeculationPath: identity, status, and score are controller-owned, and the controller wraps each path into the persisted tree entry (SpeculationPathInfo), keeping a clean ownership boundary between the seam and tree state. dependencylimit: the "how much" policy bounding how many active (in-flight) dependencies a batch may speculate over. It is the eligibility gate before enumeration; unlike the other speculation limits it is controller-held rather than injected into a seam, keeping the enumerator pure. The value is signal-driven, not a fixed constant. Each follows the repo extension contract (conflict.Analyzer reference shape): Factory.For(Config) (T, error) with Config carrying only QueueName; behavioral knobs and limit signals are integrator-injected at construction. Includes READMEs, gomock packages, and Makefile mock-gen wiring. Interfaces only; concrete impls and controller wiring are deferred.
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Summary
Add the first speculation seam and its limit counterpart from the speculation RFC, as vendor-agnostic extension interfaces under submitqueue/extension/speculation/.
enumerator: given a batch and its active dependencies ordered oldest-first (queue arrival order — the ordering that fixes which assumed-good Base prefixes exist), mechanically lists the candidate Base/Head speculation paths — pure, deterministic, and purely structural. It returns only []entity.SpeculationPath: identity, status, and score are controller-owned, and the controller wraps each path into the persisted tree entry (SpeculationPathInfo), keeping a clean ownership boundary between the seam and tree state.
dependencylimit: the "how much" policy bounding how many active (in-flight) dependencies a batch may speculate over. It is the eligibility gate before enumeration; unlike the other speculation limits it is controller-held rather than injected into a seam, keeping the enumerator pure. The value is signal-driven, not a fixed constant.
Each follows the repo extension contract (conflict.Analyzer reference shape): Factory.For(Config) (T, error) with Config carrying only QueueName; behavioral knobs and limit signals are integrator-injected at construction. Includes READMEs, gomock packages, and Makefile mock-gen wiring. Interfaces only; concrete impls and controller wiring are deferred.
Test Plan
Issues
Stack