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/commands/register-cli.ts

@@ -0,0 +1,50 @@
+import type { OpenClawPluginApi } from "openclaw/plugin-sdk";
+import { runContractorAgentsAdd } from "./contractor-agents-add.js";
+
+export function registerCli(api: OpenClawPluginApi): void {
+  api.registerCli(
+    (ctx) => {
+      // Use ctx.program.command() directly — do NOT import Commander separately.
+      // Importing a different Commander version causes _prepareForParse failures.
+      const contractorAgents = ctx.program.command("contractor-agents")
+        .description("Manage Claude-backed contractor agents");
+
+      contractorAgents
+        .command("add")
+        .description("Provision a new Claude-backed contractor agent")
+        .requiredOption("--agent-id <id>", "Agent id")
+        .requiredOption("--workspace <path>", "Workspace directory")
+        .requiredOption("--contractor <kind>", "Contractor kind (claude)")
+        .action(async (opts: { agentId: string; workspace: string; contractor: string }) => {
+          try {
+            await runContractorAgentsAdd({
+              agentId: opts.agentId,
+              workspace: opts.workspace,
+              contractor: opts.contractor,
+            });
+          } catch (err) {
+            console.error(`[contractor-agents add] Error: ${String(err)}`);
+            process.exitCode = 1;
+          }
+        });
+
+      contractorAgents
+        .command("status")
+        .description("Show status of a contractor agent (not yet implemented)")
+        .requiredOption("--agent-id <id>", "Agent id")
+        .action(() => {
+          console.log("[contractor-agents status] not yet implemented");
+        });
+    },
+    {
+      commands: ["contractor-agents"],
+      descriptors: [
+        {
+          name: "contractor-agents",
+          description: "Manage Claude-backed contractor agents",
+          hasSubcommands: true,
+        },
+      ],
+    },
+  );
+}