docs(issues): close #1 (foreground rain) — commits d95a8d2 + 4678b3e + 3e0da49

Rain bug from `docs/research/2026-04-26-sky-investigation-handoff.md`
fully resolved this session. Three commits sequentially landed the
retail-faithful path:

  3e0da49 — sky pass split + -120m weather Z offset
  4678b3e — Surface.Translucency + Luminosity plumbing
  d95a8d2 — delete legacy camera-attached particle emitter

Visual verification by user: rain renders as volumetric foreground,
direction matches retail when LCG-picked DayGroup matches retail's,
no cylinder rim visible looking up.

Two follow-up issues remain open from the visual-verify session:
  #27 — cloud rendering parity (Translucency=0.25 partial fix landed
        but cloud coverage still differs from retail, possibly
        keyframe-tint related)
  #28 — aurora/northern lights — research found NO evidence in retail
        decomp, references, or DG composition; either misremembered
        or emergent from cloud system at specific keyframes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/ISSUES.md

@@ -177,26 +177,6 @@ missing is the plugin-API surface.
 
 ---
 
-## #1 — Rain falls only to horizon, not to the player's feet
-
-**Status:** OPEN
-**Severity:** MEDIUM
-**Filed:** 2026-04-25
-**Component:** weather / particles
-
-**Description:** During Rainy DayGroups, rain particles are visible in the upper sky band but fade out before reaching the camera / ground level. Retail's rain falls all the way past the camera to the terrain.
-
-**Root cause / status:** Unknown. Likely one of: (a) particle emitter volume too short in Z, (b) particle lifetime shorter than the time it takes to traverse emitter-top → ground, (c) emitter anchored in world-space so particles escape the player's reference frame as they fall, (d) camera-relative spawn origin is offset too high above the player.
-
-**Files:**
-- `src/AcDream.App/Rendering/GameWindow.cs` — `UpdateWeatherParticles` (~line 4591)
-- `src/AcDream.Core/Vfx/ParticleSystem.cs` — emitter spawn config + lifetime integration
-
-**Research:** `docs/research/deepdives/r12-weather-daynight.md` (rain mechanism — but does not pin volume / lifetime values).
-
-**Acceptance:** Standing at 9,115 in Holtburg during a Rainy DayGroup, rain drops visibly fall all the way from the sky band past the camera to the ground level.
-
----
 
 ## #2 — Lightning visual not wired (dat-baked PES triggers)
 
@@ -338,6 +318,14 @@ missing is the plugin-API surface.
 
 # Recently closed
 
+## #1 — [DONE 2026-04-26] Rain falls only to horizon, not to the player's feet
+
+**Closed:** 2026-04-26
+**Commits:** `3e0da49` (sky pass split + retail -120m Z offset), `4678b3e` (Surface.Translucency + Luminosity correctness), `d95a8d2` (legacy emitter delete)
+**Resolution:** Two-part fix. First, rain rendering was completely re-architected to match retail's `LScape::draw` pattern at `0x00506330` — sky pass before the landblock loop (`RenderSky`), weather pass after (`RenderWeather`). Weather meshes now overlay terrain instead of being painted over. Camera anchored inside the rain cylinder via the retail-correct -120m Z offset (constant `0xc2f00000` in `GameSky::UpdatePosition` at `0x00506dd0`). Second, the per-Surface `Translucency` float (rain = 0.5) and `Luminosity` float (rain = 0.1484) were both being ignored by the renderer; plumbed end-to-end so streaks contribute at retail-correct intensity instead of 6.7× too bright. Legacy camera-attached particle emitter (`UpdateWeatherParticles` + `BuildRainDesc` + `BuildSnowDesc`) deleted; world-space mesh is the only path now. Snow rides the same fix automatically. Filed alongside two follow-up issues from the visual-verify session: `#27` (cloud rendering parity), `#28` (aurora/northern lights).
+
+---
+
 ## #26 — [DONE 2026-04-26] Stars rendered as a square in one corner of the sky
 
 **Closed:** 2026-04-26