feat(agent): unify models and validate OpenCode providers

Generate chat, task and learning models from agent-models.json.
Use WaterNetwork fast/expert models with 272k context and validate
upstream names before readiness. Add an isolated model check command
with signal-safe cleanup and plugin, Skill and MCP management docs.

Verified in isolation: type checks, 26 focused tests and both model
catalog checks; no model inference requests.

.opencode/plugins/tjwater-tools.ts

@@ -11,6 +11,7 @@ import { z } from "zod";
 import { resolve } from "node:path";
 import { registerSessionSandbox } from "../session-sandbox.js";
 import { registerMcpPolicy } from "../mcp-policy.js";
+import { checkOpencodeModels } from "../model-check.js";
 
 import add_task_human_evidence from "../tools/add_task_human_evidence.js";
 import clear_scada_analysis from "../tools/clear_scada_analysis.js";
@@ -104,6 +105,13 @@ export default Plugin.define({
     await ctx.rpc.register(Rpc.define({
       id: "tjwater.tools",
       methods: {
+        check_models: {
+          input: z.object({ models: z.array(z.object({ id: z.string(), provider_id: z.string(), model_id: z.string(), wire_id: z.string(), requires_tools: z.boolean() }).strict()).min(1).max(1000) }).strict(),
+          output: z.object({
+            models: z.array(z.object({ id: z.string(), model_id: z.string(), status: z.enum(["valid", "not_registered", "not_enabled", "no_tools", "wire_id_mismatch", "not_advertised", "unchecked"]) })),
+            providers: z.array(z.object({ id: z.string(), status: z.enum(["checked", "not_registered", "unsupported_catalog", "catalog_unavailable", "catalog_invalid", "credentials_unavailable"]), http_status: z.number().int().optional() })),
+          }),
+        },
         list: {
           input: z.object({}),
           output: z.array(z.object({ id: z.string(), direct: z.boolean(), sandboxed: z.boolean(), workspaceRoot: z.string().optional() })),
@@ -122,6 +130,7 @@ export default Plugin.define({
       },
       events: {},
     }), {
+      check_models: (input, context) => checkOpencodeModels(ctx, input, context.signal),
       mcp: mcpReport,
       list: async () => (await ctx.tool.list()).map((tool) => ({
         id: tool.id,