fix(coding-agent): kept computer worker graph off CLI startup

- The PR #7205 merge left cli.ts statically importing startComputerWorker,
  dragging the computer worker graph (and pi_natives via the pi-utils
  barrel) into normal CLI startup; --version died under --no-addons and
  dotenv loaded before profile bootstrap. worker-entry is now a
  self-starting side-effect module dispatched via dynamic import like
  every other worker selector, and utils/clipboard.ts imports the mime
  constant from its submodule instead of the barrel.
- Repointed the clipboard test spy at @oh-my-pi/pi-natives/clipboard —
  spying the barrel never intercepted the subpath the code imports, so
  the real native bridge ran (X11 timeouts on headless CI).
- Refreshed the pinned HTML export template digest and the scout gate
  phrase the system-prompt rewrite changed.

packages/coding-agent/test/export-html-template.test.ts

@@ -19,9 +19,9 @@ interface TemplateProbeResult {
 }
 
 const expectedTemplate: TemplateProbeResult = {
-	chars: 377_286,
-	bytes: 377_464,
-	sha256: "6598b2d74f905e3105474ea8033c938e92df4c33035421603ea363d72d1c81c1",
+	chars: 376_316,
+	bytes: 376_472,
+	sha256: "72721b125d8eaa0e995ef0b77e01cf561c9a76e36e745510b19734def07936e0",
 	stableCache: true,
 	assetsRemoved: 0,
 };