[qwerin]

Fixes found while play-testing co-op on multiplayer_world (Elddim). None of them is co-op-only except the last one; the same NPCs, fences and sounds were wrong in the single-player campaign.

NPCs wear their armor. ResolveNpcEquippedGear only handled es_weapon_hand / es_shield_hand, so a guard's [inventory][equipment] chest, helm, boots and gauntlets never showed and Legionnaire guards looked like townsfolk.

• NPC slots (template merged with the map instance) now go through the same EquipmentResolver.Resolve as the hero: chest armor swaps body texture slot 1, helm/boots/gauntlets are shared skinned layers posed with the body's clip.
• As in DS1, the chest item's armor_type also picks the body mesh: plate (a3) spawns on m_c_gah_fb_pos_a3 with b_c_pos_a3_*, instead of drawing the plate texture on the thin pos_a1 body where it reads as a shirt. The hero keeps his live texture swap (DressArmoredBodies off for him).
• Companions refresh their armor visuals when their paperdoll changes.

Idle actors fidget. Almost every shipped chore_default is a one-frame pose; in DS1 it never shows because actor_auto_fidgets re-queues chore_fidget after every anim. SiegeFX idled on clip 0, so e.g. the blacksmith stood rigid at his anvil.

• New ActorIdle.PickIdleChore: an authored initial_chore wins; otherwise an actor whose chore_default is static and whose fidget moves idles in chore_fidget (unless actor_auto_fidgets = false).
• Actor.CurrentClipIndex (now the testable ResolveClipIndex) keeps the idle clip when the default skrit asks for index 0. This affects most NPCs and monsters; it is also what makes the existing initial_chore idles visible.
• Only the first fidget variant loops (DS1 picks a random one each time).

Fences and walls block walking. StitchSnoDoorSeams's fallback linked any nearby unconnected walkable patches by nearest centroid with only a height gate, so the two floor strips of a t_grs01_fence_generic_wood-* tile (and house walls) got linked straight through the boards.

• Candidate links are checked best-first against the non-walkable edges of both door tiles and their neighbours; an edge standing 0.25–2.0 u over the crossing is a barrier.
• If every candidate crosses a barrier the link is held back, and restored only when dropping it would cut the mesh apart.
• Component counts and largest-component sizes are unchanged on all 81 World.dsmap and 70 MpWorld.dsmap regions; ~15.5k (SP) / ~16.5k (MP) wall- and fence-crossing links drop; Elddim's pig-pen fence goes from 30 crossings to 0.

Animation sound notes. Nothing posted DS1's we_anim_sfx when a clip crossed a sound note, so the blacksmith's blacksmith_hammer trigger (sparks + s_e_env_hammer_anvil) never ran.

• Non-hero actors dispatch each note once per loop; trigger rows match the note number in receive_world_message("we_anim_sfx",n) and only queue messages they listen for, so a looping clip can't flood a row's 4-slot inbox.
• An effect offset without its own target uses the owner's facing and live position (it was world +Z, which put the sparks 0.8 m behind him).
• prs info lists each clip's notes.

Co-op: a dropped peer no longer crashes the host. The LAN keepalive raises PeerDisconnected on a pool thread; OnPlayerLeft then removed the remote avatar from _actors while the render loop enumerated it (Collection was modified). MpSession now queues leaves and drains them at the start of Tick; NetSelfTest ticks the host after its disconnect.

Checks

• dotnet build SiegeFX.sln -c Release -warnaserror: clean. dotnet test: 158/158, including new NpcArmorTests, ActorIdleTests, NavFenceSeamTests, AnimSfxTests, SfxOwnerFacingTests, MpDisconnectTests (all data-free).
• tools/receipts.sh: all PASS; parity ledger better (template-fields 397 -> 401, animation-skrit-api 17 -> 18), no regressions.
• Play-tested host + client on multiplayer_world town_center in a co-op development branch carrying these commits: guards in full plate, blacksmith hammering with sound and sparks on the anvil, the pig-pen fence blocks, a client timing out no longer takes the host down.

🤖 Generated with Claude Code

[dafioram]

I recommend smaller PRs. This PR looks like it could be 5 PRs.

[qwerin]

Thanks for the review — split into one PR per fix, rebased on current main (v0.5.2):

• NPCs wear their armor: chest, helm, boots, gauntlets; plate on the armored body #47 NPC armor
• Idle actors fidget when their default chore is a one-frame pose #48 idle fidgets
• Nav: door-seam fallback links no longer cross fences and walls #49 fences/walls in the nav seam stitcher
• Animation sound notes fire we_anim_sfx; effect offsets follow the owner's facing #50 animation sound notes (we_anim_sfx)
• Co-op: handle a dropped peer on the session tick, not the transport thread #51 co-op: dropped peer handled on the session tick

Closing this one in their favour.