fix(dsh-plugin-browserskill): register the lazy suite from any fiber

Cordis contexts are fiber-owned: assigning onto an Object.create() overlay of
the apply-time context fails with 'cannot set property tools in multiple
fibers' when the reveal fires from the tools/result listener fiber (caught by
the e2e: the skill invocation matched but the suite never registered).
registerTools now tracks disposers through a plain closure over the captured
context — no context mutation anywhere. Also documents lazyTools in the
README and hardens the reveal against a failed registration (log and stay
hidden instead of latching).

Verified end to end against the real stack: first request carries 0 browser_*
schemas (skill catalog entry only); after the scripted skill invocation the
next request carries exactly the 11 browser_* tools and browser_session_start
dispatches for real.

packages/dsh-plugin-browserskill/src/lazy-tools.ts

@@ -103,7 +103,16 @@ export function armLazyTools(ctx: Context, registerSuite: () => () => void): ()
   const disposers: (() => void)[] = [];
   const ensureSuite = (): void => {
     if (suiteDisposer !== undefined) return;
-    suiteDisposer = registerSuite();
+    try {
+      suiteDisposer = registerSuite();
+    } catch (error) {
+      // A failed reveal must not strand the plugin: stay hidden, log, retry on
+      // the next trigger instead of latching a half-registered suite.
+      suiteDisposer = undefined;
+      console.warn(
+        `[dsh-plugin-browserskill] lazy tool registration failed: ${error instanceof Error ? error.message : String(error)}`,
+      );
+    }
   };
 
   // Live trigger: a successful model invocation of skill/browser-skill.