feat(server): integrate MCP queries and investigation messaging

Add project-bound OAuth MCP queries and controlled analysis with scoped evidence,
limits, timeouts and a nearby-model spatial query using EPSG:4326 inputs.
Default nearby searches to 200 meters and five results.

Integrate investigation messaging/presentation, health/readiness and typed history;
remove duplicate web search and fix online simulation and compressed baseline writes.
Include project migrations 023-025; keep local credentials and demo seeding excluded.

Validation: 319 focused pytest checks; real PostGIS temporary-table regression;
read-only Jinqian bridge radius comparison; cross-language MCP discovery/calls.

resources/sql/025_mcp_query_contexts.sql

@@ -0,0 +1,27 @@
+-- Additive MCP storage. Apply through the existing project database workflow.
+-- No access token, refresh token or OAuth client secret is stored here.
+BEGIN;
+CREATE TABLE IF NOT EXISTS workbench.mcp_query_contexts (
+    context_handle text PRIMARY KEY,
+    project_id uuid NOT NULL,
+    subject text NOT NULL,
+    client_id text NOT NULL,
+    document jsonb NOT NULL,
+    expires_at timestamptz NOT NULL,
+    revoked_at timestamptz,
+    created_at timestamptz NOT NULL DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS mcp_query_context_owner
+    ON workbench.mcp_query_contexts (project_id,subject,client_id);
+CREATE INDEX IF NOT EXISTS mcp_query_context_expiry
+    ON workbench.mcp_query_contexts (project_id,expires_at);
+CREATE TABLE IF NOT EXISTS workbench.mcp_query_receipts (
+    project_id uuid NOT NULL,
+    scope_key text NOT NULL,
+    call_id text NOT NULL,
+    parameters jsonb NOT NULL,
+    result jsonb NOT NULL,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    PRIMARY KEY (project_id,scope_key,call_id)
+);
+COMMIT;