BOLT-1322 [1/7] packages/command: add vehicle:check-pairing-status slug + payload + output schema

Add new vehicle command slug 'vehicle:check-pairing-status' to packages/command. Concretely: 1. New file packages/command/src/vehicle/check-pairing-status/index.ts exporting: - VehicleCheckPairingStatusCommandPayloadSchema: zod object, no required fields (empty object schema). Optional fields TBD; start with strict empty. - VehicleCheckPairingStatusCommandOutputSchema: zod object { keyPaired: z.boolean().nullable(), applicable: z.boolean(), extendedCapabilities: z.record(z.unknown()).optional() }. - VehicleCheckPairingStatusCommandType: ISupportedCommandType with slug, description, deviceType 'vehicle', payloadSchema. 2. Update packages/command/src/vehicle/enums.ts: add 'vehicle:check-pairing-status' to VehicleCommandTypes tuple. Add to VehicleCommandPayloads union. 3. Update packages/command/src/vehicle/maps.ts: register in VehicleCommandTypeMap. 4. Update packages/command/src/vehicle/index.ts: re-export from new file. 5. Optionally: extend ISupportedCommandType in common/interfaces.ts with optional 'outputSchema?: ZodTypeAny' so the output schema is colocated with the command type. Use it where validating output downstream. 6. Unit test for the new payload + output schemas (parse pass + fail cases). 7. Bump packages/command version per repo convention if there is one (check package.json + CHANGELOG). Branch: havoc/bolt-1322-command-package Worktree: ../mono-bolt-1322-command-package Done when: tests pass, package builds, slug is enumerable from CommandType union, output schema is exported.