refactor(types): consolidate 15+ *Status enums sharing pending/running/completed/failed/cancelled #6973

Discovery

A grep over autobot-backend/ for class .+Status.*Enum.*: returns 15+ separate status enums, most of which share the canonical job-lifecycle values pending/running/completed/failed/cancelled:

Two separate WorkflowStatus and two separate TaskStatus are independent definitions that drift over time. The ARC Prize plugin design surfaced this when picking the status enum for Run and SolverExecution — there is no canonical JobStatus to reuse.

Proposed change

Mirror the approach in #6689 (Severity / RiskLevel consolidation):

1. Define autobot_shared/constants/status_enums.py:JobStatus with the canonical lifecycle: PENDING, RUNNING, SUCCEEDED, FAILED, TIMEOUT, CANCELLED, COMPLETED
2. Audit the 15+ existing enums — for each, decide:
   • Reuse JobStatus directly (likely most cases)
   • Extend via class <Specific>Status(str, Enum) reusing canonical values + adding domain-specific ones (e.g., IntegrationStatus.CONFIGURED doesn't fit lifecycle)
   • Keep if genuinely orthogonal (e.g., FreshnessStatus is data-age semantics, not lifecycle)
3. Resolve the two WorkflowStatus and two TaskStatus duplicates — pick one canonical, migrate callers, delete the other.
4. Add a pre-commit lint rule rejecting new *Status(Enum) definitions outside constants/status_enums.py unless explicitly whitelisted.

Acceptance criteria

• Per-enum classification document (reuse / extend / keep)
• JobStatus defined in autobot_shared/constants/
• Reusable enums migrated; callers updated
• Two duplicates (WorkflowStatus × 2, TaskStatus × 2) resolved
• Pre-commit rule blocking new ad-hoc Status enums
• No call-site regressions (grep pre-/post for each removed name)

Related

• refactor(types): consolidate 15+ Severity/RiskLevel/Level enums onto constants/status_enums.py:Severity #6689 — same pattern for Severity/RiskLevel/Level enums
• Discovered while designing ARC Prize Phase 1 plugin (docs/superpowers/specs/2026-05-05-arc-prize-plugin-design.md, "Data Model")