Implement Bootstrap Paradox resolution for V3 site domain lookup

- Modified lookup_site_domain_v3 to strictly strip auth headers for guest lookup
- Enhanced /testing page with FQDN input and improved error visibility
- Updated TODO.md with Technical Debt refactoring roadmap
- Documented Unified Aether AI Agent (UE-AE-01) transition progress in GEMINI.md

GEMINI.md

@@ -176,6 +176,24 @@ The crucial next step is to use the **Network** tab in the browser's developer t
 
 **Outcome:**
 The activity logging functionality is now working as expected. While the original hypothesis of a circular dependency was a plausible architectural issue, the immediate problem was a more fundamental runtime error exacerbated by hidden console output. The temporary isolation of the activity log function (`src/lib/ae_idaa/idaa_activity_log.ts`) is no longer needed.
+
+---
+## Unified Aether AI Agent (UE-AE-01) Transition (2026-01-07)
+
+### Vision
+The project is moving towards a single, unified agent (UE-AE-01) with "Total System Awareness" across the entire Aether stack: MariaDB (Remote), FastAPI (Docker), SvelteKit (Local), Nginx (Proxy), and Syncthing (Storage).
+
+### Frontend Feedback & Pain Points
+The `frontend_svelte` agent provided critical feedback to `backend_fastapi` for the UE-AE-01 proposal:
+- **Automated Schema Sync:** UE-AE-01 can automatically generate TypeScript interfaces and `.editable_fields.ts` whitelists from Pydantic models and MariaDB schemas.
+- **Cross-Stack Debugging:** Unified access to Nginx, FastAPI, and Svelte logs will allow for instant root-cause analysis of 500 errors.
+- **Bootstrap Paradox Resolution:** Identified a circular dependency where `site_domain` lookup required a JWT, but the JWT required the `account_id` from the lookup. Resolved by allowing unauthenticated V3 search for `site_domain`.
+- **Environment Orchestration:** The agent should automatically manage Docker restarts and environment syncs after backend modifications.
+
+### Status
+- **V3 Search Verification:** Successfully implemented `lookup_site_domain_v3` in `ae_core__site.ts` and added a test button in `/testing`. 
+- **Migration Plan:** Root layout `+layout.ts` is slated for migration from `lookup_site_domain` (legacy) to `lookup_site_domain_v3` to fully leverage the Bootstrap Paradox fix.
+
 ---
 ## Session Learnings (2025-12-16)