Move operator notes out of repo, add generic architecture doc

memory/infrastructure.md and memory/build_log.md held environment-
specific details — hostnames, IPs, account names, credentials
retrieval commands, local kubeconfig paths, operational status
notes. These don't belong in a project repo; by convention they
live in private operator notes.

Moved to ~/shorashim-operator-notes/ (private, outside git).

In their place, added deploy/ARCHITECTURE.md — a generic
description of the deployment shape: components, external
dependencies, configuration surface. No hostnames. No IPs.
No account names. Any competent operator can read it and
know how to deploy shorashim to their own infrastructure.

Updated cross-references in AGENTS.md and BUILD_KORBAN.md to
point to "the operator's private notes" instead of memory/.

Project repo is spec + implementation + deployment shape.
Operator notes are the kohen's personal log.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

BUILD_KORBAN.md

@@ -100,7 +100,7 @@ Add to the Principles section:
 
 ## Task 3: Record Broken Tablets
 
-As you build, record what breaks and how it was fixed in `memory/build_log.md`. The correction is as important as the specification. Include:
+As you build, record what breaks and how it was fixed in the operator's build log (kept outside this repo). The correction is as important as the specification. Include:
 - What you expected vs what happened
 - The root cause
 - The fix