* docs(api): mark collection responses nullable
Describe allLinks and panel log response objects as nullable string arrays so generated clients accept the existing nil-slice wire format. Pin both schemas with buildSpec regression assertions and regenerate the OpenAPI copies.
* docs(api): include nullable Xray log responses
Allow generated response arrays to opt into nullability while retaining their schema references and Go-derived examples. Apply this to Xray logs, whose nil slices already serialize as null, and pin the schema and example through buildSpec.
Document the cookie-authenticated WebSocket upgrade and its emitted envelopes without exporting pseudo-paths. Align REST response schemas, paged-client filters, and subscription HEAD operations with their runtime implementations, then regenerate frontend and docs artifacts.
