feat: validate credentials, persist them, and switch without rebooting

PLANS.md

@@ -114,7 +114,7 @@ If all criteria pass, set this milestone to `DONE`, append its execution record,
 
 ## Milestone 001 — Prove build, flashing, and stable basic operation
 
-**Status:** `DONE`  
+**Status:** `DONE`
 **Depends on:** Milestone 000
 
 ### Objective
@@ -2306,7 +2306,7 @@ When all criteria pass, set this milestone to `DONE` and change Milestone 007 to
 
 ## Milestone 029 — Validate credentials, persist them, and switch without rebooting
 
-**Status:** `BLOCKED`  
+**Status:** `DONE`
 **Depends on:** Milestone 028
 
 ### Objective
@@ -2342,6 +2342,14 @@ Any client with network access to the device can change or delete its Wi-Fi conf
 
 When all criteria pass, set this milestone to `DONE` and change Milestone 008 to `READY`.
 
+### Execution record
+
+- Date: 2026-09-01
+- Result: PASS.
+- Evidence: The user completed the required manual device validation and confirmed that saved-network validation, persistence, no-reboot switching, fallback access, failure recovery, and profile deletion work as expected.
+- Verification: The implementation’s host tests, browser tests, JavaScript syntax check, firmware build, LittleFS build, and `git diff --check` passed. The follow-up recovery fix preserves the 30-second fallback deadline across repeated STA disconnects, retries fallback AP startup, and does not erase NVS automatically.
+- Next action: Milestone 030 remains blocked until explicitly requested and completed with its required recovery and stability evidence.
+
 ---
 
 ## Milestone 030 — Verify recovery, game continuity, and resource stability