chore(release): cli 0.2.7 + docs + Mintlify auto-deploy workflow

Wraps up the AGENTRUSH CLI release across both clients.

Lint:
- Node Biome: collapse multi-line printError() in whoami.ts
- Python ruff: drop unused BRAND_COLOR import; replace EN DASH with
  HYPHEN-MINUS in app.py docstring

Release:
- Bump @mem0/cli and mem0-cli from 0.2.6 → 0.2.7 (patch)
- Add CHANGELOG.md (Keep a Changelog format) to both CLIs, seeded
  with the 0.2.7 entry covering whoami, agent-rush <add|search>, the
  PII safety prompt, and the new agent_rush.acknowledged_at config field

Docs:
- docs/platform/cli.mdx: new sections for `mem0 whoami` and
  `mem0 agent-rush <add|search>` with rule table, error-code hints,
  the launch copy-paste block, and the public-memory warning
- llms.txt coverage already in sync (no new .mdx files)

Mintlify auto-deploy:
- New .github/workflows/mintlify-deploy.yml — pings the deploy hook on
  every push to main, bypassing the GitHub App's path-detection bug
  that caused docs.mem0.ai drift (the recurring "trigger redeploy"
  commits). Workflow is a clean no-op until MINTLIFY_DEPLOY_HOOK_URL
  repo secret is configured in dashboard.

.github/workflows/mintlify-deploy.yml

@@ -0,0 +1,39 @@
+name: Mintlify Deploy
+
+# Pings the Mintlify deploy hook on every push to main, unconditionally.
+#
+# Why: the Mintlify GitHub App detects docs changes by path-matching the
+# diff, and historically misses some legitimate docs commits — docs.mem0.ai
+# drifts out of sync and we have to push a no-op commit to force a redeploy
+# (see e.g. 843ab829 "chore: trigger Mintlify redeploy for #5152 docs").
+# Calling the hook on every push to main bypasses path detection entirely.
+#
+# Prerequisite: set repo secret MINTLIFY_DEPLOY_HOOK_URL to the value
+# generated in the Mintlify dashboard under Settings → Deploy Hooks.
+# If the secret is absent the workflow is a clean no-op (prints a warning
+# and exits 0) so this commit is safe to merge before the secret exists.
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+
+jobs:
+  trigger:
+    runs-on: ubuntu-24.04-arm
+    timeout-minutes: 2
+    steps:
+      - name: POST to Mintlify deploy hook
+        env:
+          HOOK: ${{ secrets.MINTLIFY_DEPLOY_HOOK_URL }}
+        run: |
+          if [ -z "$HOOK" ]; then
+            echo "::warning::MINTLIFY_DEPLOY_HOOK_URL is not configured; skipping deploy hook ping."
+            exit 0
+          fi
+          curl -sS --fail -X POST "$HOOK" -o /tmp/mintlify.out -w "HTTP %{http_code}\n"
+          echo "Deploy hook response:"
+          cat /tmp/mintlify.out