Strip Storm Sewer from plugin-host branch (framework only)

Removes storm_sewer module and stormsewer crate so this branch is suitable for upstream PR. Plugin host, docs, and CadCommand acquisition hooks remain.

Cargo.lock

@@ -29,7 +29,6 @@ dependencies = [
  "rayon",
  "rfd",
  "rustc-hash 2.1.2",
- "stormsewer",
  "truck-meshalgo",
  "truck-modeling",
  "truck-polymesh",
@@ -4170,15 +4169,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "quick-xml"
-version = "0.37.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "331e97a1af0bf59823e6eadffe373d7b27f485be8748f71471c662c1f269b7fb"
-dependencies = [
- "memchr 2.8.1",
-]
-
 [[package]]
 name = "quick-xml"
 version = "0.39.4"
@@ -5186,13 +5176,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
-[[package]]
-name = "stormsewer"
-version = "0.1.0"
-dependencies = [
- "quick-xml 0.37.5",
-]
-
 [[package]]
 name = "strict-num"
 version = "0.1.1"