chore(release): 0.16.1

- bump package.json / dsh.plugin.json / SIDEBAR_SERVICE_VERSION to 0.16.1
- README / README_EN: add v0.16.1 changelog (git panel freeze + restart
  loop #369: status truncation, bounded repo discovery, ?dsh-sidebar-reset
  escape hatch) and update the npm-channel install pin to ^0.16.1

src/client/service.ts

@@ -472,7 +472,7 @@ export function matchUrlTarget(tabs: readonly TabDescriptor[], url: URL): TabDes
  * The plugin version this service instance reports. Keep in lockstep with
  * `package.json`'s version — `tests/service.spec.ts` asserts the pair.
  */
-export const SIDEBAR_SERVICE_VERSION = '0.16.0'
+export const SIDEBAR_SERVICE_VERSION = '0.16.1'
 
 /**
  * Monotonic capability list consumers use to gate new API usage (features