PortfolioInvalidateByScopeRequest

Request body for `POST /api/import-sources/invalidate-by-scope` (spec §8.6). Helm AI's ScopeStore calls this after a rule write at a non-sheet scope to flip every dependent source's "ready" verdict. `reason` is bounded so a runaway client payload can't write an unbounded string into `validation_invalidated_reason` on every matched row.

scope_idrequired string
reasonrequired string

Used by (1)

POSTMark every import_source whose `subscribed_scope_ids` contains the given scope as invalidated (spec §8.6). Helm AI's ScopeStore calls this after a rule write at a non-sheet scope so dependent sources' "ready" verdicts no longer reflect the current rule set/portfolio/import-sources/invalidate-by-scope