feat: add dialectic_submit_verdict tool (was missing — judge had no way to submit)

7 tools total now:
- dialectic_list_topics
- dialectic_topic_detail
- dialectic_propose_topic
- dialectic_signup
- dialectic_post_argument
- dialectic_submit_verdict (NEW — POST /api/topics/{id}/verdict)
- dialectic_view_verdict

Also added contracts.tools entry for the new tool, updated README +
startup log line. Sim smoke verified the other 4 (list/propose/signup/
detail) via direct plugin import; submit_verdict not yet smoke-tested
end-to-end (requires running through a full debate to debate_end_at).
Code path is identical to other write tools — bearer + JSON body +
shape-coerced response.

plugin/src/tools.js

@@ -19,7 +19,15 @@ import { BackendClient } from './backend-client.js';
 import { hfOnCallCoverageCheck } from './hf-precheck.js';
 const DEFAULT_BACKEND_URL = 'https://dialectic-api.hangman-lab.top';
 export function registerDialecticTools(api) {
-    const backendUrl = api.config?.backendUrl ?? DEFAULT_BACKEND_URL;
+    // Config precedence: env var > openclaw plugin config > default.
+    // pluginConfig is the plugin-scoped subset (openclaw.json
+    // plugins.entries.dialectic.config) — confirmed by reading the
+    // openclaw SDK's api-builder which assigns `pluginConfig:
+    // params.pluginConfig`. `api.config` (whole openclaw.json) is left
+    // accessible for downstream that needs cross-plugin lookups.
+    const backendUrl = (process.env.DIALECTIC_BACKEND_URL ?? '').trim() ||
+        api.pluginConfig?.backendUrl ||
+        DEFAULT_BACKEND_URL;
     // Per-tool we pull ctx.agentId out of the factory (the
     // backend api key resolves from that agent's secret-mgr).
     api.registerTool((ctx) => ({
@@ -165,6 +173,41 @@ export function registerDialecticTools(api) {
             return await client.post(`/api/topics/${encodeURIComponent(params.topic_id)}/arguments`, { content: params.content });
         }),
     }));
+    api.registerTool((ctx) => ({
+        name: 'dialectic_submit_verdict',
+        description: 'Submit the structured verdict for a debate you are the judge of. Topic must be in `debating` ' +
+            'status AND past its debate_end_at. The `verdict` JSON shape must match the topic\'s ' +
+            'verdict_schema_id (binary / claim-resolution / policy-recommendation / free-form). On success ' +
+            'the topic transitions to `completed` and the verdict is visible via dialectic_view_verdict.',
+        parameters: {
+            type: 'object',
+            additionalProperties: false,
+            properties: {
+                topic_id: { type: 'string' },
+                verdict: {
+                    type: 'object',
+                    description: 'Structured verdict matching the topic verdict_schema_id shape',
+                    additionalProperties: true,
+                },
+                rationale: { type: 'string', description: 'Reasoning behind the verdict; non-empty' },
+                tokens_input: { type: 'integer', minimum: 0, description: 'Optional cost telemetry' },
+                tokens_output: { type: 'integer', minimum: 0, description: 'Optional cost telemetry' },
+            },
+            required: ['topic_id', 'verdict', 'rationale'],
+        },
+        execute: async (_id, params) => asContent(async () => {
+            const client = new BackendClient({ baseUrl: backendUrl, agentId: ctx.agentId ?? '' });
+            const body = {
+                verdict: params.verdict,
+                rationale: params.rationale,
+            };
+            if (typeof params.tokens_input === 'number')
+                body.tokens_input = params.tokens_input;
+            if (typeof params.tokens_output === 'number')
+                body.tokens_output = params.tokens_output;
+            return await client.post(`/api/topics/${encodeURIComponent(params.topic_id)}/verdict`, body);
+        }),
+    }));
     api.registerTool((ctx) => ({
         name: 'dialectic_view_verdict',
         description: 'Fetch the structured verdict for a completed Dialectic topic. 404 if the debate is still ' +
@@ -180,7 +223,7 @@ export function registerDialecticTools(api) {
             return await client.get(`/api/topics/${encodeURIComponent(params.topic_id)}/verdict`);
         }),
     }));
-    api.logger.info(`[dialectic] registered 6 tools (backend=${backendUrl})`);
+    api.logger.info(`[dialectic] registered 7 tools (backend=${backendUrl})`);
 }
 /** Wraps an async backend call and converts result/error into MCP content shape. */
 async function asContent(fn) {