Lab #2361: serve rejects doctor.datastores, cluster.instances and serve.config requests: no zod schema

Description

Three request types in the serve ServerRequest union (src/serve/protocol.ts) have dispatch cases in src/serve/connection.ts but no zod schema in ServerRequestSchema (the z.discriminatedUnion around connection.ts:1267). validateServerRequest therefore rejects every such request with invalid_request before the dispatch case is reached, so the handlers are unreachable over the WebSocket protocol.

Request type	Sender	Dispatch case	Impact
`doctor.datastores`	CLI: `swamp doctor datastores --server` (src/cli/commands/doctor_datastores.ts:496)	connection.ts:3117 -> handleDoctorDatastores	The CLI command always fails against a serve
`cluster.instances`	Dashboard over WebSocket (packages/dashboard/src/views/System.tsx:59)	connection.ts:3600	Dashboard System view cannot load cluster instances over WS (the REST route `/api/v1/cluster/instances` bypasses zod and still works)
`serve.config`	Dashboard over WebSocket (packages/dashboard/src/views/System.tsx:60)	connection.ts:3612	Dashboard System view cannot load serve config

The sibling doctor requests (doctor.vaults, doctor.secrets, doctor.workflows, doctor.extensions) do have schemas; only doctor.datastores is missing.

Steps to Reproduce

Start swamp serve locally.
Run swamp doctor datastores --server http://127.0.0.1:<port>.
Observe an invalid_request error instead of the datastore doctor report.

Expected

Each request type in the ServerRequest union has a matching zod schema, and a test asserts that every ServerRequest type has one.

Additional Context

Found while triaging swamp-club#2356 (workflow resume --from fails over serve because from is missing from WorkflowResumeRequestSchema). That fix adds a compile-time parity check between protocol.ts payload fields and the zod schemas; it pins these three schema-less types in an allowlist that this issue should empty.

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