docs(meta): PR #194 I3 — §8 step 6 erratum + D-226 filter-axis note (T-1161 two-axes supersedes COMPOSITE_SMOOTH retirement)

Tyre's exact capture: the design pass's 'retire COMPOSITE_SMOOTH /
crisp draw_rect as the only path' is superseded — the const survives
as the compile-time pipeline axis, the crisp path stays as debug/
compare, and crispness-at-sparse-rungs is delivered by the per-rung
sampling-filter policy instead. T-1155's retirement framing is
cancelled (ticket closes on merge). Also records the R2 softening:
the T-1162 relief band adds sub-district elevation variance at
Quarter cutoff, so temperature no longer steps strictly at the
district there — intended, noted so nobody is surprised later.

Tickets: T-1161, T-1162

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/architecture/atlas-zoom-ladder-t1143.md

@@ -171,6 +171,8 @@ Each step shippable and independently verifiable; steps 1–3 extend `derive_dis
 5. **Client rung-selection + progressive refinement** in `AtlasWindowViewer`: request granularity tracks zoom level; on zoom-in, hold coarse + fetch fine + swap on arrival. Merges the district/quarter screens into one continuum. The click-through seam at planetary→regional (T-1124 §5) is preserved as-is — see §10.
 6. **Retire `COMPOSITE_SMOOTH`** (`atlas_window_overlay.gd:60`) once granularity-4 (quarter) windows are the default at close zoom — real classified quarter-cells replace what the linear-filter stretch was compensating for; delete the const and the smoothing branch, leaving the crisp `draw_rect` path as the only path.
 
+   > **Erratum (T-1161, PR #194 review — Tyre, 2026-07-22):** step 6's "retire COMPOSITE_SMOOTH entirely / crisp draw_rect as the only path" is **superseded**. COMPOSITE_SMOOTH survives as a compile-time *pipeline* axis (texture vs. per-cell rects); the crisp draw_rect path is retained as the debug/compare path. What T-1155 framed as "retire the smoothing" is delivered instead as a per-rung *sampling-filter* axis (`_filter_for_granularity_v2`): Region/orbital-mosaic → NEAREST (bilinear stretch at 204.8 km/cell reads as smoothing-over-absence), District/Quarter → LINEAR (cell density earns the blend), unknown → LINEAR. T-1155's COMPOSITE_SMOOTH-retirement framing is cancelled; T-1161 supersedes it. Related record note, same review: the T-1162 relief band adds sub-district elevation variance at Quarter cutoff, and elevation feeds the temperature lapse — so R2's "temperature steps at the district" is now slightly softened by relief-driven elevation within a district at Quarter. Intended consequence, noted so nobody is surprised later.
+
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 ## 9. Risks