chore: regen spec.types.ts from spec draft @142b3c3c

pnpm fetch:spec-types. Spec moved 44 commits since last regen.

Brings:
- RequestMetaObject with namespaced io.modelcontextprotocol/* keys (required protocolVersion/clientInfo/clientCapabilities)
- Result.resultType: "complete" | "input_required" (required)
- DiscoverRequest/Result, InputRequiredResult, InputRequest/Response/s, InputResponseRequestParams
- SubscriptionsListenRequest, SubscriptionFilter, SubscriptionsAcknowledgedNotification
- UnsupportedProtocolVersionError, MissingRequiredClientCapabilityError (-32003)

Removes (moved to extension or removed from spec):
- InitializeRequest/Result, InitializedNotification, PingRequest, SetLevelRequest
- SubscribeRequest, UnsubscribeRequest, RootsListChangedNotification
- All Task* types, taskSupport, TaskAugmentedRequestParams

Typecheck broken pending next commit (schemas.ts/guards.ts reference removed types).
Isolated for diff clarity per plan §10.

Author: felixweinberger