docs(A.5 T27): roadmap + ISSUES + CLAUDE.md updates for A.5 ship

Roadmap (2026-04-11-roadmap.md):
- Status header updated to 2026-05-10 / A.5 as the shipped phase.
- A.5 row added to shipped table (after A.3): two-tier streaming,
  QualityPreset, Bug A/B fixes, deferred items, plan archive link.
- A.5 sub-piece in Phase A section marked SHIPPED with archive link
  (replaces the old "not yet brainstormed" entry).
- N.6 bullet changed from "Currently in flight" to "Planned
  (post-A.5 polish takes priority)"; A.5's landing means the
  "direct higher-radius comparison once A.5 lands" item is now
  available.

ISSUES.md:
- #52 (A.5/lifestone-missing): Holtburg lifestone not rendering since
  A.5 dev; two root-cause candidates; investigation approach.
- #53 (A.5/tier1-redo): classification cache reverted at 9b49009;
  animation-mutation audit required before retry; 1-week estimate.
- #54 (A.5/jobkind-plumbing): Bug A's post-load strip wastes worker
  CPU; proper fix plumbs JobKind through BuildLandblockForStreaming;
  30 min–1 hour estimate.

CLAUDE.md:
- "Currently in flight" paragraph updated from N.6 to Post-A.5 polish
  (issues #52/#53/#54) with note that N.6 follows.
- A.5 shipped paragraph added (mirrors N.5b/N.5/N.4 format).
- WB integration cribs: new bullet documenting the two-tier streaming
  architecture (StreamingRegion / StreamingController / LandblockStreamer
  / GpuWorldState, N₁/N₂ defaults, QualitySettings, spec pointer).

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

CLAUDE.md

@@ -110,6 +110,21 @@ ourselves".
   uvec2 + `sampler2DArray(handle)` constructor pattern (NOT the direct
   `uniform sampler2DArray` + `glProgramUniformHandleARB` form, which
   GL_INVALID_OPERATIONs on at least one driver).
+- **Two-tier streaming architecture (Phase A.5, shipped 2026-05-10).**
+  `src/AcDream.App/Streaming/` owns the full streaming pipeline. Key types:
+  `StreamingRegion` (two-radius Chebyshev window: N₁=near, N₂=far; produces
+  `TwoTierDiff` with 5 transition lists per tick), `StreamingController`
+  (render-thread coordinator: routes `TwoTierDiff` to the worker queue and
+  drains completions up to `MaxCompletionsPerFrame` per frame),
+  `LandblockStreamer` (single background worker thread: `LoadFar` = heightmap
+  + mesh only, `LoadNear` = heightmap + `LandBlockInfo` + scenery + mesh,
+  `PromoteToNear` = `LandBlockInfo` + scenery only),
+  `GpuWorldState` (render-thread entity state: `AddEntitiesToExistingLandblock`
+  for promotions, `RemoveEntitiesFromLandblock` for demotions).
+  Default: N₁=4 (81 near LBs, full detail), N₂=12 (544 far LBs, terrain
+  only). Quality Preset system (`QualitySettings.From(preset)`) controls
+  both radii and MSAA/anisotropic/A2C/completions-per-frame as a unit.
+  Spec: `docs/superpowers/specs/2026-05-09-phase-a5-two-tier-streaming-design.md`.
 
 **Execution phases:** R1→R8 in the architecture doc. Each phase has clear
 goals, test criteria, and builds on the previous. Don't skip phases.
@@ -510,19 +525,19 @@ acdream's plan lives in two files committed to the repo:
   acceptance criteria. Do not drift from the spec without explicit user
   approval.
 
-**Currently in flight: Phase N.6 — Perf polish.**
-Roadmap entry at [`docs/plans/2026-04-11-roadmap.md`](docs/plans/2026-04-11-roadmap.md).
-Builds on N.5 + N.5b. Legacy renderers (`InstancedMeshRenderer`,
-`StaticMeshRenderer`, `WbFoundationFlag`) were retired in the N.5 ship
-amendment, and the terrain legacy renderer (`TerrainChunkRenderer` +
-`TerrainRenderer` + legacy `terrain.vert/.frag`) was retired in N.5b.
-N.6 scope is perf-only: WB atlas adoption, persistent-mapped buffers
-(strong candidate after N.5b's per-frame DEIC `BufferSubData`),
-GPU-side culling via compute pre-pass, GL_TIME_ELAPSED query
-double-buffering, direct higher-radius perf comparison once A.5 lands,
-legacy `Texture2D`/`sampler2D` TextureCache path retirement (Sky / Debug
-remain on the legacy path now that Terrain has migrated).
-Plan + spec written when work begins.
+**Currently in flight: Post-A.5 polish — Tier 1 retry + lifestone fix + JobKind plumbing.**
+Open issues: #52 (lifestone missing), #53 (Tier 1 entity cache redo with animation-mutation
+audit), #54 (JobKind plumbing through BuildLandblockForStreaming for proper far-tier skip).
+After those three close, the next planned phase is N.6 (perf polish) — see roadmap for scope.
+
+**Phase A.5 (Two-tier Streaming + Horizon LOD) shipped 2026-05-10.**
+N₁=4 near-tier (81 LBs, full detail) + N₂=12 far-tier (544 LBs, terrain only); fog
+horizon; QualityPreset system (Low/Medium/High/Ultra) with env-var overrides; F11
+mid-session reapply. Two post-ship-prep bugs fixed: Bug A (far-tier worker was loading
+full entity layer — ~71K entities, ~5x perf regression vs spec), Bug B (WalkEntities
+per-frame list alloc — ~480 KB/frame GC pressure). Tier 1 entity cache reverted (animation
+regression; see #53). Plan archived at
+[`docs/superpowers/plans/2026-05-09-phase-a5-two-tier-streaming.md`](docs/superpowers/plans/2026-05-09-phase-a5-two-tier-streaming.md).
 
 **Phase N.5b (Terrain on Modern Rendering Path) shipped 2026-05-09.**
 `TerrainModernRenderer` mirrors WB's `TerrainRenderManager` pattern