Add adapter capability flags for opencode_k8s

Declare supportsInstructionsBundle, instructionsPathKey, and
requiresMaterializedRuntimeSkills on ServerAdapterModule. opencode_k8s
does not support instructions bundles (instructions are piped via init
container) and does not require materialized runtime skills (bundled in
container image).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/server/index.ts

@@ -16,6 +16,9 @@ export function createServerAdapter(): ServerAdapterModule {
     supportsLocalAgentJwt: true,
     agentConfigurationDoc,
     getConfigSchema,
+    supportsInstructionsBundle: false,
+    instructionsPathKey: undefined,
+    requiresMaterializedRuntimeSkills: false,
     sessionManagement: getAdapterSessionManagement("opencode_local") ?? {
       supportsSessionResume: true,
       nativeContextManagement: "unknown",