docs(M1): reflect chat/toast revert + the actual B.5 polish (creature pickup guard)

docs/plans/2026-05-12-milestones.md

@@ -107,7 +107,7 @@ up an item from the ground.
 | 1 | Walk through Holtburg without getting stuck | ✅ met | L.2a/d/g shipped 2026-05-12; Holtburg doorway verified |
 | 2 | Open the inn door | ✅ met | B.4b (interaction) + B.4c (swing animation) shipped 2026-05-13 |
 | 3 | Click an NPC and see selection feedback | ✅ met | B.4b chain + chat handlers; verified 2026-05-14 (Tirenia + Royal Guard double-click → NPC dialogue in chat panel) |
-| 4 | Pick up an item from the ground | ✅ met (close-range path) | B.5 + post-B.5 PickupEvent fix shipped 2026-05-14; visual-verified at Holtburg; pickup chat/toast feedback added in `87ba5c9` |
+| 4 | Pick up an item from the ground | ✅ met (close-range path) | B.5 + post-B.5 `PickupEvent (0xF74A)` fix shipped 2026-05-14; visual-verified at Holtburg; creature-pickup guard added in `a01ebd5` |
 
 **What's left to formally land M1:**
 - Record ~30s demo video of the four-target scenario end-to-end.
@@ -140,8 +140,14 @@ up an item from the ground.
 - **B.5** — `BuildPickUp` (PutItemInContainer 0x0019) + `SendPickUp`
   helper + F-key wiring + new `PickupEvent (0xF74A)` despawn handler.
   Shipped 2026-05-14.
-- **B.5 polish** (`87ba5c9`) — pickup feedback chat line + toast so the
-  M1 demo's "pick up" target has visible payoff.
+- **B.5 polish** (`a01ebd5`) — guard `SendPickUp` against creature
+  targets so F-on-NPC produces a "Can't pick that up" toast instead of
+  the malformed pickup that triggered ACE's `WeenieError 0x0029` + NPC
+  emote chain. (Briefly visited adding "You pick up the X." chat /
+  toast feedback for ground pickups in `87ba5c9`, then reverted in
+  `20ecb23` — retail doesn't show that line for ground pickups; only
+  for items received from NPCs / other characters, and that path is
+  separate.)
 
 **Freeze on landing:**
 - L.2 zone (collision, cell ownership, transition parity, wire authority)