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Patrick Buckley
37ed6bbf5b
Foundation PR for the multi-stage-review follow-up. Introduces a single source of truth for workstream kind values and pushes tenant scoping into the storage protocol so list callers can't forget to filter client-side. - WorkstreamKind(StrEnum) replaces bare "interactive" / "coordinator" literals across 17 production modules. Strict mypy narrows every internal call site; raw strings still work at wide boundaries (HTTP body, DB row) via WorkstreamKind(raw) parse at the edge. - StorageBackend.list_workstreams(..., user_id=None) adds a SQL-level WHERE user_id = :user_id gate on both sqlite and postgres impls. Memory wrapper forwards the new filters. - register_workstream now validates kind at the storage edge so SDK / restore / internal callers can't silently corrupt the NOT NULL column with empty / mis-cased / unknown values. - WebUI.__init__ normalizes empty-string parent_ws_id to None, matching the storage-edge and WorkstreamManager invariants. - POST /v1/api/workstreams/new parses body["kind"] through the enum and returns 400 on unknown kinds instead of silent coercion. Absorbs bug-1, bug-2, bug-4/q-6, q-1, q-8, and partial q-2 (wrapper signature forwards the new filters; full deletion of the unused wrapper stays in the cleanup PR).
