feat(sp24): align CLAUDE.md + REQUIREMENTS.md + ARCHITECTURE.md with auth work + AUTH_DISABLED WARNING

Replaces every stale 'no auth' / 'no authentication' / 'no second party to
authenticate' claim in the three top-level docs with the v1 posture: the
auth boundary is HTTP (bcrypt + HttpOnly session cookie; first admin
bootstrapped from CYCLONE_ADMIN_USERNAME + CYCLONE_ADMIN_PASSWORD env
vars); the file-system posture (SQLCipher at rest, macOS Keychain) is
unchanged; the threat model is still a stolen/imaged drive.

Closes requirements §11 R-1 (was Open; now Closed by SP24 — auth shipped
via the origin/main merge on 2026-06-23, SP24 reconciled the docs).

Also:
- backend/src/cyclone/__main__.py — emit WARNING when AUTH_DISABLED is
  True at boot so a misconfigured production deploy fails loudly
- §6.1 migrations table in ARCHITECTURE.md — list 0013 (auth_users_and_
  sessions) and 0014 (audit_log_user_id) with the renumbering note
- §4.2 module map — add the cyclone.auth.* package
- Three skills addenda: cyclone-tests (AUTH_DISABLED conftest bypass is
  mandatory context), cyclone-api-router (every router needs
  Depends(matrix_gate)), cyclone-spec (spec template threat-model is now
  auth-aware)

This also tracks CLAUDE.md in git for the first time (was previously
untracked; the SP24 doc updates are in scope for the increment).

Spec: docs/superpowers/specs/2026-06-23-cyclone-auth-posture-alignment-design.md
Plan: docs/superpowers/plans/2026-06-23-cyclone-auth-posture-alignment.md

backend/src/cyclone/__main__.py

@@ -24,6 +24,20 @@ def main() -> None:
     from cyclone.auth import bootstrap
     bootstrap.run()
 
+    # SP24: if the AUTH_DISABLED escape hatch is on, scream at boot so a
+    # misconfigured production deploy fails loudly. The flag is flipped by
+    # ``CYCLONE_AUTH_DISABLED=1`` (see ``cyclone.auth.bootstrap``) and by the
+    # pytest conftest autouse fixture (see ``.superpowers/skills/cyclone-tests``).
+    from cyclone.auth import deps as _auth_deps
+
+    if _auth_deps.AUTH_DISABLED:
+        import logging
+
+        logging.getLogger("cyclone").warning(
+            "AUTH_DISABLED is set (CYCLONE_AUTH_DISABLED=1) — all requests "
+            "treated as admin, dev only. Do NOT enable this in production."
+        )
+
     if len(sys.argv) >= 2 and sys.argv[1] == "serve":
         port = os.environ.get("CYCLONE_PORT", "8000")
         reload = os.environ.get("CYCLONE_RELOAD", "0") == "1"