refactor(errors): surface 57 deferred catch-and-swallow sites via logger

The earlier sweep cleaned the hot path (worker/runtime/automation/api-
server/ipc core — 59 sites). This pass finishes the deferred long tail:
main/* services, database/* CRUD modules, api-server/* routes, ipc-*
handlers, thread-integration, automation helpers, browser, skills.

Default strategy: catch (error) { logger.warn("[module] context:", ...) }
— preserve current behavior, make the failure visible instead of
silently hidden. Widened 3 logger interface signatures to include warn
where callers only passed info/error previously (thread-helpers,
host-environment-service, ipc-domain-common).

Legitimate boundaries left intact: JSON.parse on untrusted input, DNS
resolver no-records paths, explicit safe* helpers (safeJson, parseJson,
parseTriggerDetail), URL-parse predicates, and `<unserialisable>`
fallbacks inside the prompt-builder summarisers. Each kept catch now
either has a reason in context or is a documented safe* helper.

Tests adjusted only where test-constructed no-op loggers needed a warn
stub (message-dispatch, company-mode-switch, ipc-agent-graph-handlers).

With the earlier pass, AgentCompany no longer has silently-swallowing
catch blocks in main-process or renderer business code.

src/main/api-server/routes-agents.ts

@@ -156,7 +156,8 @@ export function registerAgentRoutes(server: AgentApiServer) {
     let agent;
     try {
       agent = db.getAgent(requireParam(params, "agentId"));
-    } catch {
+    } catch (err) {
+      log.warn(`[api/agents] getAgent failed:`, err instanceof Error ? err.message : String(err));
       server.json(res, 404, { error: "Agent not found" });
       return;
     }
@@ -262,7 +263,8 @@ export function registerAgentRoutes(server: AgentApiServer) {
     const connectorRecord = (() => {
       try {
         return db.getConnector(input.connectorId);
-      } catch {
+      } catch (err) {
+        log.warn(`[api/agents] getConnector failed for ${input.connectorId}:`, err instanceof Error ? err.message : String(err));
         return null;
       }
     })();
@@ -305,7 +307,8 @@ export function registerAgentRoutes(server: AgentApiServer) {
       ? (() => {
         try {
           return db.getAgent(resolvedReportsTo).name;
-        } catch {
+        } catch (err) {
+          log.warn(`[api/agents] getAgent failed for manager ${resolvedReportsTo}:`, err instanceof Error ? err.message : String(err));
           return resolvedReportsTo;
         }
       })()