fix(idaa): fix Novi UUID verification — stuck spinner, repeat calls, impersonation

Critical bugs fixed:
- $derived(() => {}) stored the function itself; uuid/api_key were always
  undefined so verification never fired. Fixed to $derived.by(() => {}).
- novi_verifying pre-initialized to true (flash prevention) was also used as
  the concurrency guard — guard saw it as in-flight and exited immediately,
  leaving the spinner stuck forever. Split into separate verify_in_flight flag.
- $idaa_loc reads in dedupe snapshot (outside untrack) subscribed the effect
  to idaa_loc writes, causing needless re-runs post-verification.
- Rate limit was not UUID-aware: 429 on one UUID blocked impersonation
  (new UUID). TTL and rate-limit guards now both bypass when UUID changes.

Also includes: store defaults for novi_verified_ts + novi_rate_limited_until,
docs update, iframe template g_uuid param (prior agent changes).

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

documentation/CLIENT__IDAA_and_customized_mods.md

@@ -544,7 +544,8 @@ ae_loc.idaa_loc = { novi_uuid: 'test-uuid-value', ... };
 ---
 
 ## IDAA Novi Groups and Moderators
-IDAA Couples Meeting = "e9e162f0-3d03-4241-9682-340135ec3fb8"
+
+### IDAA Couples Meeting = "e9e162f0-3d03-4241-9682-340135ec3fb8"
 
 "Gregory X Boehm" "00ee764c-7559-496b-9d18-40d3e9092c0c"
 "Kee B. PARK" "24ab3297-bfce-473c-9311-4b31e3a8974f"
@@ -553,10 +554,17 @@ IDAA Couples Meeting = "e9e162f0-3d03-4241-9682-340135ec3fb8"
 "Owen Lander" "9671a2c4-ff95-48c2-bcde-5c6eba95cded"
 "Susan Park" "4a9f94c5-d766-4808-ab76-117c9e43903a"
 
-"Student/Resident Meeting Moderators" "d76d2c00-962d-40f6-a2e8-ed9c85594d96"
+### "Student/Resident Meeting Moderators" "d76d2c00-962d-40f6-a2e8-ed9c85594d96"
+
 "Melissa Eve Valasky" "182d1db3-caa9-41bc-b04a-2facc6859aeb"
 "Steven L. Klein" "5724aad7-6d89-47e7-8943-966fd22911bd"
 
+### "IDAA BIPOC Meeting" "873d3ad0-2605-4ccf-824c-638c16b2b9cf"
+
+"Paula Lynn Bailey-Walton" "68383ba2-0989-4860-9ea6-073f9698df67"
+"Tasha Hudson" "03d5408c-3c13-4c3a-a93f-49871f9050b1"
+
+
 ---
 
 **Document Status:** ✅ Current