docs(flomni): record sim-validation results for the at_each_angle hook

Notes what was actually exercised against the live sim (registration/
list/unregister, per-job param snapshot including the reset-to-None
case, the hook firing during a real tomo_queue_execute() run, and the
unregistered-hook incomplete/resume path) and the scan_repeat retry
bug found and fixed along the way.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

csaxs_bec/bec_ipython_client/plugins/flomni/AI_docs/TOMO_QUEUE_COMMAND_JOBS_PLAN.md

@@ -10,7 +10,9 @@ blank params table. Sim-tested: `omny_e2e_tests/test_tomo_queue_command_jobs.py`
 movement was exercised against `ftray` (sim-testable stand-in), not `mokev`/`idgap`
 (real front-end only — see §10). A CLI-level `tomo_queue_move(index, new_index)` has
 since been added alongside `tomo_queue_add`/`_delete`/`_clear`, enforcing the same
-running-job floor as §6.4. **Step 3 (the `TomoQueueDialog` GUI work) has a first
+running-job floor as §6.4. A curated, session-only `at_each_angle_hook` registry
+(§3.4) has been added and sim-validated — see §3.4's "Sim-validated" note; CLI-only,
+no GUI widget yet. **Step 3 (the `TomoQueueDialog` GUI work) has a first
 iteration built** — the command-job builder dialog (§6.5), command-job-aware queue
 rendering, the status-keyed delete/clear guards from §6.3, a "Sort queue…" mode for
 mid-run reorder of pending/incomplete rows (§6.4 — up/down buttons, not drag-and-drop,
@@ -317,6 +319,19 @@ registry, same spirit as `_TOMO_QUEUE_ACTIONS` but distinct from it —
   operator-facing writeup (what a hook function looks like, how to register/activate/
   unregister/list one).
 
+**Sim-validated** (against the live simulated flOMNI, not just mocked): registration/
+list/unregister bookkeeping; the params snapshot carrying `at_each_angle_hook` per
+job (and correctly resetting to `None` for the next one); the hook actually firing
+during a real `tomo_queue_execute()` run; an unregistered hook's job ending up
+`incomplete` and resuming cleanly once the hook is re-registered. Found and fixed one
+real bug in the process, unrelated to the hook logic itself: `_tomo_scan_at_angle` is
+wrapped in `@scan_repeat(max_repeats=10, default=True)`, which retried the new
+`FlomniError` (unregistered hook) 10 times before giving up with a generic
+`TooManyScanRestarts` — the actual error message never reached the operator. Fixed
+with an `exc_handler` that skips the retry for any `FlomniError` (see the
+`_retry_unless_flomni_error` docstring in `flomni.py`); this benefits every other
+`FlomniError` the method can raise, not just the hook-registry one.
+
 ---
 
 ## 4. New / changed CLI methods (`flomni.py`)