PF1e (SRD Movement, Position and Distance): "You can move through a square occupied by a friendly character, unless you are charging." The move and run descents now route their Dijkstra cost field and greedy steps over hostile-only blocking (_blocked_hostile), so allies' squares are passable; a friendly square may only be entered when a free cell descends from it and the path tail is trimmed, so movement never ENDS on an occupied cell. Charge, withdraw, the auto 5-foot step and the Observation cost fields keep full blocking (documented). Corridor tests added; the Combat Reflexes multi-AoO transcript is unchanged. README updated.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
PF1e (SRD Measuring Distance): "You can't move diagonally past a corner (even by taking a 5-foot step)." _step5_to now rejects a diagonal destination whose two flanking squares are not both passable, reusing Grid.diagonal_allowed - the same corner rule the regular movement already applies. README updated.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
ctan