refactor(terminal-pane): fold the fork's trust preflight onto the canonical one

`preflightForkAgentTrust` was a behavioural duplicate of `preflightAgentTrust`,
whose signature now accepts a nullable agent and workspace path and so is a
drop-in replacement. Its file is left holding only the launch-platform resolver
— which is not a duplicate, since it returns an override rather than a default —
so the file is renamed for what it now contains.

src/renderer/src/components/terminal-pane/terminal-agent-session-fork-launch-platform.ts

@@ -1,5 +1,3 @@
-import { TUI_AGENT_CONFIG } from '../../../../shared/tui-agent-config'
-import type { TuiAgent } from '../../../../shared/tui-agent'
 import { isWslUncPath } from '../../../../shared/wsl-paths'
 import type { ProjectExecutionRuntimeResolution } from '../../../../shared/project-execution-runtime'
 
@@ -19,24 +17,3 @@ export function getForkAgentLaunchPlatform(args: {
   }
   return undefined
 }
-
-export async function preflightForkAgentTrust(args: {
-  agent: TuiAgent
-  workspacePath?: string | null
-  connectionId?: string | null
-}): Promise<void> {
-  const { agent, workspacePath, connectionId } = args
-  const preflight = TUI_AGENT_CONFIG[agent].preflightTrust
-  if (!preflight || !workspacePath || !window.api.agentTrust?.markTrusted) {
-    return
-  }
-  try {
-    await window.api.agentTrust.markTrusted({
-      preset: preflight,
-      workspacePath,
-      ...(connectionId ? { connectionId } : {})
-    })
-  } catch {
-    // Best-effort: if the trust artifact cannot be written, keep the existing launch path.
-  }
-}

src/renderer/src/components/terminal-pane/terminal-agent-session-fork.ts

@@ -9,10 +9,8 @@ import { activateAndRevealWorktree } from '@/lib/worktree-activation'
 import { useAppStore } from '@/store'
 import { makePaneKey } from '../../../../shared/stable-pane-id'
 import { TUI_AGENT_CONFIG } from '../../../../shared/tui-agent-config'
-import {
-  getForkAgentLaunchPlatform,
-  preflightForkAgentTrust
-} from './terminal-agent-session-fork-agent-preflight'
+import { getForkAgentLaunchPlatform } from './terminal-agent-session-fork-launch-platform'
+import { preflightAgentTrust } from '@/lib/agent-trust-preflight'
 import { slugifyForWorkspaceName } from '../../../../shared/workspace-name'
 import { FLOATING_TERMINAL_WORKTREE_ID } from '../../../../shared/constants'
 import type { TuiAgent } from '../../../../shared/tui-agent'
@@ -231,7 +229,7 @@ export async function startAgentSessionFork(fork: PreparedAgentSessionFork): Pro
     activateAndRevealWorktree(forkWorktreeId, { sidebarRevealBehavior: 'auto' })
     return copyAgentSessionForkContext(fork)
   }
-  await preflightForkAgentTrust({
+  await preflightAgentTrust({
     agent: fork.agent,
     workspacePath: created.worktree.path,
     connectionId: sourceRepo?.connectionId