refactor: restructure to plugin/ + services/ layout and add per-turn bootstrap injection

- Migrate src/ → plugin/ (plugin/core/, plugin/web/, plugin/commands/)
  and src/mcp/ → services/ per OpenClaw plugin dev spec
- Add Gemini CLI backend (plugin/core/gemini/sdk-adapter.ts) with GEMINI.md
  system-prompt injection
- Inject bootstrap as stateless system prompt on every turn instead of
  first turn only: Claude via --system-prompt, Gemini via workspace/GEMINI.md;
  eliminates isFirstTurn branch, keeps skills in sync with OpenClaw snapshots
- Fix session-map-store defensive parsing (sessions ?? []) to handle bare {}
  reset files without crashing on .find()
- Add docs/TEST_FLOW.md with E2E test scenarios and expected outcomes
- Add docs/claude/BRIDGE_MODEL_FINDINGS.md with contractor-probe results

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugin/core/openclaw/agents-add-runner.ts

@@ -0,0 +1,20 @@
+import { execFileSync } from "node:child_process";
+
+export type AddBaseAgentInput = {
+  agentId: string;
+  workspace: string;
+  bridgeModel: string;
+};
+
+/**
+ * Create the base OpenClaw agent using the `openclaw agents add` CLI.
+ * This sets up routing and workspace; contractor metadata is written separately.
+ */
+export function createBaseAgent(input: AddBaseAgentInput): void {
+  const { agentId, workspace, bridgeModel } = input;
+  execFileSync(
+    "openclaw",
+    ["agents", "add", agentId, "--workspace", workspace, "--model", bridgeModel, "--non-interactive"],
+    { stdio: "inherit" },
+  );
+}