feat(simulation): feature-name pipeline wired + legacy window_granularity u32 retired (T-1169, T-1159)

One commit for two tickets whose changes share the bridge/plugin
plumbing files. T-1169 connects the three dormant feature-name pieces:
atlas_feature_names populated at regen (17,891 rows — 15,190 mountain,
2,701 river — via populate_atlas_feature_names mirroring the city-names
importer; systems.db regenerated, stamp fresh), attach_feature_names
wired into the cascade's Topography block with name pools threaded
DB-free through AnalyzeBody (D-225 pattern) and assignments stored on
Layer1Output/BodyWorldState for future consumers, and a
FeatureNamesRequest/Response read proxy as the bridge's 7th tagged
envelope (D-236 pattern, both SimBridge impls). Client label DRAW is
deliberately NOT here — implementation proved both river and mountain
labels need a wire-carried position (the pool is position-free; course
polylines aren't correlated with the named attractors by construction) —
deferred to T-1195's single design pass. cascade_layer1 golden re-pinned
(additive feature_names field).

T-1159 retires the legacy u32 granularity field fully shadowed by
window_granularity_v2: AtlasLayerRequest.window_granularity,
DistrictWindowLayer.granularity echo, the u32::MAX sentinel, and
resolve_window_granularity are gone server-side; client encode paths and
the caller-less atlas_window_cache legacy key component dropped;
msgpack fixtures regenerated; the T-1150 aliasing regression test now
drives through the surviving enum field. The district_window carrier
itself survives byte-compatible per D-255(c).

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

client/scripts/autoloads/sim_bridge.gd

@@ -434,21 +434,22 @@ func send_named_action(action_name: String, action_data: Variant = null) -> void
 ## whole-body-layer caller (show_body()'s existing request), so their wire
 ## traffic is byte-unchanged.
 ##
-## window_granularity/window_min_wl_m (T-1150): struct/key plumbing for the
-## zoom-ladder quarter rung — district (0/omitted) stays the default for
-## every caller in this codebase today.
+## window_min_wl_m (T-1150): struct/key plumbing for the octave cutoff — 0
+## (omitted) stays the default for every caller in this codebase today.
 ##
-## window_granularity_v2 (T-1152/T-1153): the R5-redesigned string-tag
-## granularity ("Quarter"/"District"/"Region") — the ONLY way to request the
-## coarser-than-district Region rung the legacy u32 field cannot express.
-## Empty string (omitted) is the default for every caller that doesn't pass
-## it, byte-compatible with every pre-T-1152 request.
+## window_granularity_v2 (T-1152/T-1153): the string-tag granularity
+## ("Quarter"/"District"/"Region") — the way to request the coarser-than-
+## district Region rung. Empty string (omitted) is the default for every
+## caller that doesn't pass it, resolving to District server-side.
+##
+## T-1159: the legacy `window_granularity: int` parameter this function used
+## to also forward is retired — see atlas_map_protocol.gd's
+## encode_atlas_layer_request doc for the full rationale.
 func request_atlas_layers(
 	body_id: String,
 	up_to: String = "Topography",
 	window_center: Variant = null,
 	window_n: int = 0,
-	window_granularity: int = 0,
 	window_min_wl_m: int = 0,
 	window_granularity_v2: String = ""
 ) -> void:
@@ -459,7 +460,6 @@ func request_atlas_layers(
 		up_to,
 		window_center,
 		window_n,
-		window_granularity,
 		window_min_wl_m,
 		window_granularity_v2
 	)

client/scripts/protocol/atlas_map_protocol.gd

@@ -32,29 +32,27 @@ class_name AtlasMapProtocol
 ## client-side default/cap constants (DISTRICT_WINDOW_DEFAULT_N/MAX_N) live on
 ## the regional-window viewer, not duplicated into the codec.
 ##
-## `window_granularity`/`window_min_wl_m` (T-1150): the derivation-granularity
-## axis (district=1/omitted vs. quarter=4) and the octave cutoff, in whole
-## metres. Both OMITTED (not sent as 0) when at their default — this is
-## struct/key plumbing only (T-1150 scope): no caller in this codebase
-## requests quarter granularity yet (that's T-1153); this function just makes
-## it possible to ask, byte-compatible with every existing caller that
-## doesn't pass them.
+## `window_min_wl_m` (T-1150): the octave cutoff, in whole metres. OMITTED
+## (not sent as 0) when at its default — struct/key plumbing, byte-compatible
+## with every existing caller that doesn't pass it.
 ##
 ## `window_granularity_v2` (T-1152, R5 redesign — see
-## server/src/atlas/layer_proxy.rs's `WindowGranularity` doc): the ONLY way to
-## express a coarser-than-district rung (`"Region"`) the legacy `u32` field
-## cannot encode. A plain STRING variant tag ("Quarter" | "District" |
+## server/src/atlas/layer_proxy.rs's `WindowGranularity` doc): the derivation
+## granularity, a plain STRING variant tag ("Quarter" | "District" |
 ## "Region"), matching `RoadNodeKind`'s existing wire precedent on this same
 ## carrier (a bare `#[derive(Serialize, Deserialize)]` enum with no
 ## `#[serde(rename_all)]` — rmp_serde encodes the Rust variant NAME verbatim,
 ## not an integer discriminant). OMITTED (not sent as "") when
 ## `window_granularity_v2` is the empty string — `#[serde(default)]` on the
-## Rust side decodes absence as `None`, falling back to the legacy `u32`
-## field's `resolve_window_granularity_v2()` precedence rule (that field wins
-## over the legacy one whenever present — see that Rust doc for the full
-## precedence contract). Every pre-T-1152 caller (and every T-1150 caller that
-## only ever sends `window_granularity`) omits this field entirely and stays
-## byte-compatible.
+## Rust side decodes absence as `None`, resolving to District (the default
+## rung).
+##
+## **T-1159:** the legacy `window_granularity: int` field this codec used to
+## also encode (T-1150's finer-than-district-only `u32` wire encoding) is
+## retired — `window_granularity_v2` fully shadowed it since T-1152, and no
+## caller in this codebase (nor any external client — single-repo
+## client/server pair) ever sent it as anything but the byte-compatible
+## default.
 ##
 ## **Quantization split (PR #191 review, Hoshe 1 / Tyre C3):** `window_min_wl_m`
 ## is sent HERE as a raw, unquantized value — this codec does NOT snap it to
@@ -71,7 +69,6 @@ static func encode_atlas_layer_request(
 	up_to: String = "Topography",
 	window_center: Variant = null,
 	window_n: int = 0,
-	window_granularity: int = 0,
 	window_min_wl_m: int = 0,
 	window_granularity_v2: String = ""
 ) -> PackedByteArray:
@@ -80,8 +77,6 @@ static func encode_atlas_layer_request(
 		var center: Vector2i = window_center
 		msg["window_center"] = [center.x, center.y]
 		msg["window_n"] = window_n
-		if window_granularity != 0:
-			msg["window_granularity"] = window_granularity
 		if window_min_wl_m != 0:
 			msg["window_min_wl_m"] = window_min_wl_m
 		if not window_granularity_v2.is_empty():

client/scripts/protocol/protocol.gd

@@ -786,17 +786,18 @@ static func encode_request_bookmark_catalog() -> PackedByteArray:
 ## windowed district-resolution regional-map query — see
 ## atlas_map_protocol.gd's encode_atlas_layer_request doc for the wire shape.
 ## Omitted callers (every whole-body-layer call site predating T-1138) are
-## byte-unchanged. window_granularity/window_min_wl_m (T-1150): same
-## byte-compatibility contract, see atlas_map_protocol.gd.
-## window_granularity_v2 (T-1152): the R5-redesigned string-tag granularity
-## ("Quarter"/"District"/"Region") — the only way to request the Region rung.
-## Omitted (empty string) by every caller that doesn't pass it.
+## byte-unchanged. window_min_wl_m (T-1150): same byte-compatibility
+## contract, see atlas_map_protocol.gd.
+## window_granularity_v2 (T-1152): the string-tag granularity
+## ("Quarter"/"District"/"Region"). Omitted (empty string) by every caller
+## that doesn't pass it, resolving to District server-side. T-1159: the
+## legacy `window_granularity: int` parameter this used to also forward is
+## retired — see atlas_map_protocol.gd's encode_atlas_layer_request doc.
 static func encode_atlas_layer_request(
 	body_id: String,
 	up_to: String = "Topography",
 	window_center: Variant = null,
 	window_n: int = 0,
-	window_granularity: int = 0,
 	window_min_wl_m: int = 0,
 	window_granularity_v2: String = ""
 ) -> PackedByteArray:
@@ -806,7 +807,6 @@ static func encode_atlas_layer_request(
 		up_to,
 		window_center,
 		window_n,
-		window_granularity,
 		window_min_wl_m,
 		window_granularity_v2
 	)