Lane B R27 (on-call): the R26 handshake verified against G's real manifest

R27 owes B nothing ("B/D: notes current; nothing else owed"; "B/D on-call").
This is on-call work on F's #5: the tour is specified as "Monster Robot Party's
frontage (B's mark visible)" — a claim R26 could not test, because G's manifest
did not exist and B proved the treatment against a temp manifest it scaffolded
and deleted. G shipped the real one (36d10ca). Now measured, not assumed.

Monster Robot Party is in redhill_godverse — NOT newtown_godverse, the only
town B ever tested the mark in. F's money shot is posed in a town this
treatment had never been verified against. It works.

The handshake held unmodified: G's {version, shops:[{godverseShopId, types,
sourcing}]} lands inside B's tolerant reader with zero coordination. The
tier→sourcing rename did not touch B — the mark never reads that field, so a
rename of it cannot break the footpath. A cue that reads no field cannot break
when the field moves.

Both arms proven live, the discriminating arm for the first time (R26's temp
manifest marked all 18 keyed shops, so "the manifest is the authority, not the
key" was never exercised). Redhill: 9 keyed, only 4 stocked.
  Monster Robot Party #3962749 (real)  keyed + in manifest → MARKED
  Silky Oak Furnature #31              keyed, not in manifest → BARE
  Thrift Shop and Eternity Boutique    keyed, not in manifest → BARE
Two keyed shops stand metres from a stocked one wearing no mark, because they
have no crate. The street advertises exactly the crates that exist. (#31 is
Fable's R25 id-namespace shop; the mark reads godverseShopId only, unaffected.)
Frontage 135 draws / 74,354 tris, 0 page errors, manifest prefetched at boot.

Intel for F's #5, no action owed: the novelty_record landmark (B's furniture —
a giant vinyl disc marking record shops) stands 2.5m off the frontage and is
prominent head-on. Ray-grid occlusion so F can frame without guessing:
  mark+sign   head-on 4% blocked   off-axis +4m 0%
  window      head-on 22% blocked  off-axis +4m 44%
Shoot HEAD-ON: the vinyl sits low (y~1.3), the mark rides high (y~3.3), and
stepping off-axis doubles window occlusion instead of helping. I first read the
black disc as a render bug — it isn't, it's the landmark working; recorded so
the next reader doesn't re-open it.

Notes-only; no code changed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/LANES/LANE_B_NOTES.md

@@ -1,5 +1,57 @@
 # LANE B — NOTES (measured)
 
+## Round 27 (on-call) — the R26 handshake **verified against G's real manifest**; intel for F's #5 money shot
+
+R27 owes B nothing (*"B/D: notes current; nothing else owed"*, *"B/D on-call"*). This is on-call work: F's
+tour (#5) is specified as *Monster Robot Party's frontage, **B's mark visible*** — a claim my R26 verification
+could not actually test, because G's manifest didn't exist yet and I proved the treatment against a **temp
+manifest I scaffolded and deleted**. G has since shipped the real one (`36d10ca`). Claim now measured, not
+assumed.
+
+**Monster Robot Party is in `redhill_godverse`, not `newtown_godverse`** — the only town B ever tested the
+mark in. F's money shot is posed in a town this treatment had never been verified against. It works.
+
+### The R26 handshake held, unmodified
+G's real emission is `{version:1, shops:[{godverseShopId, types, sourcing}]}` — 15 entries, lands inside B's
+tolerant reader (`.shops`, objects carrying `godverseShopId`) with **zero coordination**, exactly as the R26
+note promised. **The `tier` → `sourcing` rename (Fable's waves-1-2 ruling) did not touch B**: the mark
+deliberately never reads that field, so a rename of it cannot break the footpath. *The "don't leak tier"
+call paid a dividend it wasn't designed for — a cue that reads no field cannot break when the field moves.*
+
+### Both arms proven live — the discriminating arm for the first time
+R26's temp manifest marked **all 18** keyed shops, so "manifest is the authority, not the key" was never
+actually exercised. G's real manifest makes it load-bearing: redhill has **9 keyed, only 4 stocked**.
+Measured at Monster Robot's frontage (live chunk set), ground truth vs render:
+| shop | keyed | in manifest | rendered |
+|---|---|---|---|
+| **Monster Robot Party #3962749** (`real`) | ✓ | ✓ | **marked** ✓ |
+| Silky Oak Furnature #31 | ✓ | ✗ | **bare** ✓ |
+| Thrift Shop and Eternity Boutique #908 | ✓ | ✗ | **bare** ✓ |
+
+Two keyed shops stand metres from a stocked one wearing no mark, because they have no crate. **The street
+advertises exactly the crates that exist.** (#31 is the same shop as Fable's R25 id-namespace bug — its
+godverse id collides with a plan id; the mark reads `godverseShopId` only, so it is unaffected.)
+
+Frontage: **135 draws / 74,354 tris**, 0 page errors, manifest prefetched at boot.
+
+### Intel for F's #5 (no action needed from B)
+The **`novelty_record` landmark** (B's furniture — a giant 0x1a1a1a vinyl disc on a post, marking record
+shops) stands 2.5 m off Monster Robot's frontage and is **prominent in the head-on frame**. Measured
+occlusion by ray-grid, so F can frame without guessing:
+| band | head-on (8 m) | off-axis (+4 m) |
+|---|---|---|
+| **mark + sign** | **4%** blocked | 0% |
+| window glass | 22% blocked | **44%** blocked |
+
+**Shoot head-on.** The vinyl sits low (y≈1.3) and the mark rides high (y≈3.3), so it never meaningfully
+occludes the mark; stepping off-axis *doubles* the window occlusion instead of helping. A giant vinyl record
+in the frame of a record-shop money shot is a feature, not a blemish. *(I first read the black disc as a
+render bug — it isn't; it's the landmark doing its job. Recorded so the next reader doesn't re-open it.)*
+
+No code changed this round; notes-only.
+
+---
+
 ## Round 26 (Fable's ROUND26 → Lane B) — #5 the polish pick: **the stocked shopfront reads from the footpath**
 
 **Shipped. A stocked godverse shop now tells you it's diggable before you reach the door — a crate of