* Streamlining the login flow commands

* More documentation fixes

* fixup! Streamlining the login flow commands

* Receiver-rename hangover: align user-facing prose to 'receiver'

Tal's reducer→receiver rename (#87) was bulk-perl across docs but missed
several user-facing strings in the MCP server. This sweeps:

- log10x_savings tool intent string
- log10x_advise_install schema description + ranked-table output
- advise-receiver default release_name (now my-receiver)
- compactReceiver advisor prose ('reducer pod' → 'receiver pod')
- POC YAML view label + emitted-comment header
- discover-env JSDoc

Internal bits left intentionally:
- Internal AdvisorApp = 'reducer' (Tal's PR kept this)
- kubectl label selectors targeting app.kubernetes.io/name=reducer
  (helm charts not yet renamed — selectors must match deployed pods)
- Internal data fields snapshot.recommendations.reducer{Gitops,Compact}*
  (owned by us; can be renamed when type sweep lands)

* Bump engines.node from >=18 to >=20

CI already runs on 20.x + 22.x and the comment in ci.yml documents
why: undici@7 (transitive via @elastic/elasticsearch@9) requires
Node 20+ globals (File). Node 18 went EOL 2025-04-30. Engines field
and install doc were stale at >=18.

* chore: bump to 1.6.6

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Co-authored-by: Dor Levi <11015255+dor-levi@users.noreply.github.com>