feat(redstone-link): real block textures via build-textures.py, add build.sh

The first textures were a motif floating on a flat slab. That hits the
lesson already documented on mailbox_block(): an icon-like sprite "reads
as a placeholder when applied to all 6 faces of a cube". Replaced with
machine faces whose traces run out to the edges, so they connect across
tile boundaries and a wall of them reads as continuous circuitry --
transmitter radiating out, receiver feeding in.

Generated through scripts/build-textures.py using the existing palette and
rect/px/save helpers rather than an ad-hoc script, so they regenerate with
everything else. Running the pipeline also rewrites the other five
textures, but pixel-identically -- that churn is only a newer Pillow
re-encoding, so those files are left alone.

RP header bumped to 1.0.1 (with the BP dependency to match) because clients
cache packs by uuid+version and would otherwise keep serving the old art.
The lobby world pin was updated to match; a mismatch silently drops the
pack from the stack.

Adds build.sh to package the .mcaddon, mirroring addon/build.sh. It omits
that script's `-x` exclude: these packs have no dotfiles, and dropping it
keeps the script working with the 7-Zip `zip` shim on the workstation as
well as Info-ZIP on the CI runner.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015Gf1kZypRDfPL1YiWUS1LC

scripts/build-textures.py

@@ -397,12 +397,99 @@ def portal_field() -> Image.Image:
     return img
 
 
+# ── Redstone Link transmitter / receiver ───────────────────
+# Machine faces, not icons. Following the mailbox lesson: the motif has to
+# reach the edges or a cube of it reads as a placeholder. Both share a gunmetal
+# plate with corner rivets and a beveled frame; the transmitter carries redstone
+# traces radiating OUT to all four edges, the receiver carries traces running IN
+# to a collector dish. Same silhouette, mirrored behaviour, different accent.
+
+LINK_PLATE = (62, 66, 74)
+LINK_PLATE_HL = (92, 97, 107)
+LINK_PLATE_SH = (38, 41, 47)
+LINK_RIVET = (140, 146, 158)
+
+TX_TRACE = (168, 30, 28)
+TX_TRACE_HOT = REDSTONE_BRIGHT
+TX_CORE = (255, 140, 110)
+
+RX_TRACE = (34, 96, 150)
+RX_TRACE_HOT = (92, 178, 240)
+RX_CORE = (200, 240, 255)
+
+
+def _link_plate() -> Image.Image:
+    """Shared gunmetal base: beveled frame + corner rivets, fully opaque."""
+    img = Image.new("RGBA", (16, 16), LINK_PLATE)
+    # Bevel: lit top/left, shadowed bottom/right
+    rect(img, 0, 0, 15, 0, LINK_PLATE_HL)
+    rect(img, 0, 0, 0, 15, LINK_PLATE_HL)
+    rect(img, 0, 15, 15, 15, LINK_PLATE_SH)
+    rect(img, 15, 0, 15, 15, LINK_PLATE_SH)
+    # Corner rivets
+    for cx, cy in ((2, 2), (13, 2), (2, 13), (13, 13)):
+        px(img, cx, cy, LINK_RIVET)
+        px(img, cx, cy + 1, LINK_PLATE_SH)
+    return img
+
+
+def redstone_link_tx() -> Image.Image:
+    img = _link_plate()
+    # Traces running from the core out to all four edges: this is what makes a
+    # cube of it read as wiring rather than a centred sprite.
+    rect(img, 7, 0, 8, 15, TX_TRACE)
+    rect(img, 0, 7, 15, 8, TX_TRACE)
+    # Diagonal spurs toward the corners
+    for i in range(3, 7):
+        px(img, i, i, TX_TRACE)
+        px(img, 15 - i, i, TX_TRACE)
+        px(img, i, 15 - i, TX_TRACE)
+        px(img, 15 - i, 15 - i, TX_TRACE)
+    # Emitter core, hot centre
+    rect(img, 6, 6, 9, 9, TX_TRACE_HOT)
+    rect(img, 7, 7, 8, 8, TX_CORE)
+    px(img, 7, 7, (255, 235, 220))
+    # Trace highlight so the cross reads as raised
+    rect(img, 7, 1, 7, 5, TX_TRACE_HOT)
+    rect(img, 1, 7, 5, 7, TX_TRACE_HOT)
+    return img
+
+
+def redstone_link_rx() -> Image.Image:
+    img = _link_plate()
+    # Collector rings, broken at the axes so the in-running traces read clearly
+    for x in range(3, 13):
+        px(img, x, 3, RX_TRACE)
+        px(img, x, 12, RX_TRACE)
+    for y in range(3, 13):
+        px(img, 3, y, RX_TRACE)
+        px(img, 12, y, RX_TRACE)
+    for x in range(5, 11):
+        px(img, x, 5, RX_TRACE_HOT)
+        px(img, x, 10, RX_TRACE_HOT)
+    for y in range(5, 11):
+        px(img, 5, y, RX_TRACE_HOT)
+        px(img, 10, y, RX_TRACE_HOT)
+    # Feed lines from the edges into the dish
+    rect(img, 7, 0, 8, 2, RX_TRACE)
+    rect(img, 7, 13, 8, 15, RX_TRACE)
+    rect(img, 0, 7, 2, 8, RX_TRACE)
+    rect(img, 13, 7, 15, 8, RX_TRACE)
+    # Collector core
+    rect(img, 7, 7, 8, 8, RX_TRACE_HOT)
+    px(img, 7, 7, RX_CORE)
+    px(img, 8, 8, RX_CORE)
+    return img
+
+
 def main() -> None:
     save(smart_crafting_table(), "smart-crafting-addon/smart_crafting_RP/textures/blocks/smart_crafting_table.png")
     save(post_office_block(), "postal-service-addon/postal_service_RP/textures/blocks/post_office.png")
     save(mailbox_block(), "postal-service-addon/postal_service_RP/textures/blocks/mailbox.png")
     save(tent_canvas(), "camping-supplies-addon/camping_supplies_RP/textures/blocks/tent_canvas.png")
     save(portal_field(), "lobby-addon/lobby_transfer_RP/textures/blocks/portal_field.png")
+    save(redstone_link_tx(), "redstone-link-addon/redstone_link_RP/textures/blocks/redstone_link_tx.png")
+    save(redstone_link_rx(), "redstone-link-addon/redstone_link_RP/textures/blocks/redstone_link_rx.png")
 
 
 if __name__ == "__main__":