feat(feedback): disclose session sharing in the /feedback acknowledgement

The /feedback acknowledgement now echoes the receiving session id and
reports the mounted telemetry backend's sharing policy: the telemetry seam
exposes a backend-independent TelemetrySharingStatus through a required
abstract sharing member on the Telemetry service, the OTel backend maps its
mode onto it, and the command appends one policy-only sharing sentence
(full / feedback-only / disabled / not configured) to the acknowledgement.
The web client renders the text through the existing command row without a
client change; a new assembled-browser e2e mounts the shipped telemetry row
in FULL mode against a local dead endpoint and pins the shipped default
sentence as a keyless golden.

packages/feedback/command-feedback/tests/loader-composition.spec.ts

@@ -93,7 +93,7 @@ describe('/feedback real Loader composition through cordis.yml', () => {
     const userId = getOrCreateAnonymousUserId({ env: { DSH_HOME: root } })
     expect(accepted?.result).toEqual({
       kind: 'success',
-      text: `Feedback recorded for session feedback-loader-agent\nUser: ${userId}`,
+      text: `Feedback recorded for session feedback-loader-agent\nUser: ${userId}. Session sharing is not configured.`,
     })
     const rejected = await context.commands.execute(owner, '/feedback', signal)
     expect(rejected?.result).toEqual({