fix(rules): restrict nauseated creatures to a single move action

PF1e (SRD Conditions, nauseated): "The only action such a character can take is a single move actions per turn." _NAUSEA_MOVE_KINDS now holds only genuine move actions (move, stand_up, retrieve_weapon, repair_weapon): the 5-foot step and dropping prone are free actions and are dropped by the nauseated filter. The pinned filter test was retargeted; README updated.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/pf1e_simulator/combat.py

@@ -6388,10 +6388,12 @@ def _choose_spell_action(
 
 
 _SWIFT_BONUS_KINDS: frozenset[str] = frozenset({"deed", "inspire_courage", "swift"})
-# PF1e (CRB): a nauseated creature can take only a single move action per
-# turn — no standard, no full-round, no attacks, no spellcasting.
+# PF1e (SRD Conditions, nauseated): "The only action such a character can
+# take is a single move action per turn" — genuine move actions only: the
+# 5-foot step and dropping prone are free actions, not move actions, and
+# run/charge/withdraw are full-round.
 _NAUSEA_MOVE_KINDS: frozenset[str] = frozenset(
-    {"move", "5foot_step", "stand_up", "drop_prone"}
+    {"move", "stand_up", "retrieve_weapon", "repair_weapon"}
 )
 
 # Casting-time plumbing for the budget filters: a cast_spell action consumes