wire up /agent/execute and /agent/stop endpoints

- Add runSessionAgent: streaming variant of runAgent that PATCHes VIBN DB
  after every LLM turn and tool call so frontend can poll live output
- Track changed files from write_file / replace_in_file tool calls
- Add /agent/execute: receives sessionId + giteaRepo + task, clones repo,
  scopes workspace to appPath, runs Coder agent async (returns 202 immediately)
- Add /agent/stop: sets stopped flag; agent checks between turns and exits cleanly
- Agent does NOT commit on completion — leaves changes for user review/approval

Made-with: Cursor

dist/agent-session-runner.d.ts

@@ -0,0 +1,28 @@
+/**
+ * agent-session-runner.ts
+ *
+ * Streaming variant of runAgent wired to a VIBN agent_sessions row.
+ * After every LLM turn + tool call, it PATCHes the session in the VIBN DB
+ * so the frontend can poll (and later WebSocket) the live output.
+ *
+ * Key differences from runAgent:
+ *  - Accepts an `emit` callback instead of updating job-store
+ *  - Accepts an `isStopped` check so the frontend can cancel mid-run
+ *  - Tracks which files were written/modified for the changed_files panel
+ *  - Calls vibn-frontend's PATCH /api/projects/[id]/agent/sessions/[sid]
+ */
+import { AgentConfig } from './agents';
+import { ToolContext } from './tools';
+export interface OutputLine {
+    ts: string;
+    type: 'step' | 'stdout' | 'stderr' | 'info' | 'error' | 'done';
+    text: string;
+}
+export interface SessionRunOptions {
+    sessionId: string;
+    projectId: string;
+    vibnApiUrl: string;
+    appPath: string;
+    isStopped: () => boolean;
+}
+export declare function runSessionAgent(config: AgentConfig, task: string, ctx: ToolContext, opts: SessionRunOptions): Promise<void>;