diff --git a/C-progress.md b/C-progress.md
index 0dd6a0c..2482f4f 100644
--- a/C-progress.md
+++ b/C-progress.md
@@ -3,7 +3,35 @@
 *Status: **v1 complete & verified**. Standalone interiors library + test page. Every shop door opens
 into a unique, seeded, themed interior, generated on demand in ~4ms, byte-identical every revisit.*
 
-Last updated: 2026-07-16 (round 18) · owner: PROCITY-C · reviewer: Fable
+Last updated: 2026-07-16 (round 19) · owner: PROCITY-C · reviewer: Fable
+
+---
+
+## Update 2026-07-16 (round 19, v4.0-alpha CLOSE) — re-soak katoomba on REAL roads (against A's in-flight pass)
+
+R19 §Lane C (on-call, ledger #5): E's roads landed (`dbb52c2` — katoomba_real is now **schema v2, 484 real
+roads**), so I re-ran the 20-door soak against the real street graph — closing the R18 "re-run when roads land"
+caveat. **Honest caveat: the working tree also carried Lane A's UNCOMMITTED R19 fragmentation pass** (plan_osm.js
+WIP — `JOIN_TOL`/`BRIDGE_MAX`, junction-protected Douglas–Peucker, shopless-island cull / shop-island bridge),
+so the dev server served A's *in-progress* finalization, not a frozen state. Read this as "interiors survive
+A's real-graph pipeline as it stands mid-round"; a clean confirm follows A's commit.
+
+**Robust result (holds whatever A's WIP does):** every shop the plan produced builds a **valid interior** —
+0 throws · 0 carves · 0 path-fails · 0 over-budget · worst **147** draws (min 115); 3 gig venues
+(pub/band_room/rsl — **district placement holds on the real graph**); plan deterministic (byte-identical
+re-gen). Lot dims **unchanged** (7.5–8.5 × 14) → interiors are dim-identical to R18 (road-agnostic confirmed;
+my R18 degenerate-lot proof already spans anything the real graph can seat).
+
+**Shop count observed = 19 (NOT filed as a defect).** The plan yielded 19 shops here, but against A's in-flight
+fragmentation code that's expected, not a bug — A's ruling explicitly culls shopless islands and bridges/
+drops-with-count shop-bearing ones, so the final count is A's to pin (could land at 20 connected or an explicit
+19 with a `norm.dropped` count). I'm not attributing it to A as a finding; I only confirm interiors build clean
+whichever way it resolves. (If A's committed pass surprises with a shop that *can't* build an interior, that
+would be the finding — none did in this run.)
+
+**Final C spot-confirm pending A's COMMITTED finalization + golden pin** (per Fable's sequencing, C confirms
+after A). When A pins `katoomba_real`'s real-roads golden I'll re-run once against the frozen state. Docs-only
+round for C.
 
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