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.

cli/python/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mem0-cli"
-version = "0.2.6"
+version = "0.2.7"
 description = "The official CLI for mem0 — the memory layer for AI agents"
 readme = "README.md"
 license = "Apache-2.0"