feat: web_search + youtube_transcribe tools, shell interrupt backgrounding, fixes

- Add web_search tool (Firecrawl POST to /v1/search with query, limit, lang, country, scrapeOptions)
- Add youtube_transcribe tool (GET to transcriber service, handles completed/queued/failed statuses)
- Both tools registered for parent agents (always) and child agents (permission-gated)
- Added to summon enum, TOOL_DESCRIPTIONS, and core exports
- Shell interrupt: run_shell now races against user queue interrupt
  - When interrupted, command continues in background with run_shell_<uuid> job ID
  - BackgroundShellStore holds running processes, auto-cleans 10min after completion
  - retrieve tool extended to handle both agent IDs and shell job IDs
- Tool error detection: results starting with 'Error:' now marked isError in UI
- Fix TS error: cast unavailMatch[1] regex capture group to string
- Docker: network_mode host for Tailscale/LAN access to external services
- Bun.serve idleTimeout set to 60s (was default 10s)
- KeyUsage: clearer message when OpenCode usage data unavailable
- Firecrawl: only send scrapeOptions when scrape=true (avoid 400 on instances without scrape support)

1 files changed, 4 insertions, 3 deletions

diff --git a/packages/core/src/agent/agent.ts b/packages/core/src/agent/agent.ts
index b4c0eec..64a602b 100644
--- a/packages/core/src/agent/agent.ts
+++ b/packages/core/src/agent/agent.ts
@@ -196,11 +196,12 @@ export class Agent {
 		});
 
 			const rawResult = await execPromise;
+			const resultStr = typeof rawResult === "string" ? rawResult : JSON.stringify(rawResult);
 			return {
 				toolCallId: tc.id,
 				toolName: tc.name,
-				result: typeof rawResult === "string" ? rawResult : JSON.stringify(rawResult),
-				isError: false,
+				result: resultStr,
+				isError: resultStr.startsWith("Error:"),
 			};
 		} catch (err) {
 			return {
@@ -326,7 +327,7 @@ export class Agent {
 
 					// Model tried to call an unavailable tool.
 					// Add a synthetic tool call + error result for the bad tool.
-					const badToolName = unavailMatch[1];
+					const badToolName = unavailMatch[1] as string;
 					const fakeId = `unavail_${crypto.randomUUID().slice(0, 8)}`;
 					const availableTools = Object.keys(aiTools).join(", ");
 					const errorResult = `Tool "${badToolName}" is not available. Available tools: ${availableTools}. Please use only available tools.`;