fix(plugin): f64 pick coords + harden out-of-process lifecycle

Follow-ups after merging the out-of-process plugin isolation work:

- Convert the out-of-process interactive adapter's `on_point` /
  `on_entity_pick` to `glam::DVec3`, matching the `CadCommand` trait,
  which moved to f64 pick coordinates. The branch predated that change
  and no longer compiled against the trait.
- Contain plugin constructor panics in `export_plugin!`: the constructor
  runs across the C ABI boundary in `ocs_plugin_register`, where an
  unwinding panic is undefined behavior. Catch it and return null, which
  the loader already treats as a failed registration.
- Reap killed runner processes. The spawn-timeout and disconnect paths
  called `child.kill()` without `wait()`, leaving a zombie on Unix until
  the host exited. Route both — and `shutdown()` — through a shared
  `reap()` that kills and waits on a detached thread.

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

Cargo.lock

@@ -29,7 +29,6 @@ dependencies = [
  "image",
  "inventory",
  "js-sys",
- "libloading",
  "lzma-sys",
  "ocs_plugin_api",
  "open",
@@ -72,7 +71,7 @@ name = "acadrust"
 version = "0.3.4"
 source = "git+https://github.com/HakanSeven12/acadrust?branch=main#7b6bbf4a620540e917d6254b1c87076f76909973"
 dependencies = [
- "ahash",
+ "ahash 0.8.12",
  "anyhow",
  "bitflags 2.11.1",
  "byteorder",
@@ -84,6 +83,7 @@ dependencies = [
  "nom 7.1.3",
  "once_cell",
  "ryu",
+ "serde",
  "thiserror 1.0.69",
 ]
 
@@ -104,6 +104,17 @@ dependencies = [
  "cpufeatures",
 ]
 
+[[package]]
+name = "ahash"
+version = "0.7.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "891477e0c6a8957309ee5c45a6368af3ae14bb510732d2684ffa19af310920f9"
+dependencies = [
+ "getrandom 0.2.17",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "ahash"
 version = "0.8.12"
@@ -694,6 +705,9 @@ name = "bitflags"
 version = "2.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4512299f36f043ab09a583e57bceb5a5aab7a73db1805848e8fef3c9e8c78b3"
+dependencies = [
+ "serde_core",
+]
 
 [[package]]
 name = "bitreader"
@@ -713,6 +727,18 @@ dependencies = [
  "no_std_io2",
 ]
 
+[[package]]
+name = "bitvec"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddcec3d12c579d40898fe0a9a358a803c23e9c52ca3c425707f81c9436211837"
+dependencies = [
+ "funty",
+ "radium",
+ "tap",
+ "wyz",
+]
+
 [[package]]
 name = "block"
 version = "0.1.6"
@@ -799,6 +825,28 @@ version = "3.20.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72f5acc6cb2ba439de613abc23857ec3d78374d8ed5ac84e9d11336e87da8649"
 
+[[package]]
+name = "bytecheck"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23cdc57ce23ac53c931e88a43d06d070a6fd142f2617be5855eb75efc9beb1c2"
+dependencies = [
+ "bytecheck_derive",
+ "ptr_meta",
+ "simdutf8",
+]
+
+[[package]]
+name = "bytecheck_derive"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3db406d29fbcd95542e92559bed4d8ad92636d1ca8b3b72ede10b4bcc010e659"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "bytecount"
 version = "0.6.9"
@@ -1382,6 +1430,12 @@ dependencies = [
  "libloading",
 ]
 
+[[package]]
+name = "doctest-file"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2db04e74f0a9a93103b50e90b96024c9b2bdca8bce6a632ec71b88736d3d359"
+
 [[package]]
 name = "document-features"
 version = "0.2.12"
@@ -1730,6 +1784,12 @@ version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ab85b9b05e3978cc9a9cf8fea7f01b494e1a09ed3037e16ba39edc7a29eb61a"
 
+[[package]]
+name = "funty"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6d5a32815ae3f33302d95fdcb2ce17862f8c65363dcfd29360480ba1001fc9c"
+
 [[package]]
 name = "futf"
 version = "0.1.5"
@@ -2092,6 +2152,15 @@ dependencies = [
  "smallvec",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash 0.7.8",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
@@ -2508,6 +2577,19 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "interprocess"
+version = "2.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "069323743400cb7ab06a8fe5c1ed911d36b6919ec531661d034c89083629595b"
+dependencies = [
+ "doctest-file",
+ "libc",
+ "recvmsg",
+ "widestring",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "inventory"
 version = "0.3.24"
@@ -3781,6 +3863,13 @@ name = "ocs_plugin_api"
 version = "0.1.0"
 dependencies = [
  "acadrust",
+ "bincode",
+ "interprocess",
+ "libloading",
+ "memmap2",
+ "rkyv",
+ "serde",
+ "thiserror 1.0.69",
 ]
 
 [[package]]
@@ -4281,6 +4370,26 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "ptr_meta"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0738ccf7ea06b608c10564b31debd4f5bc5e197fc8bfe088f68ae5ce81e7a4f1"
+dependencies = [
+ "ptr_meta_derive",
+]
+
+[[package]]
+name = "ptr_meta_derive"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16b845dbfca988fa33db069c0e230574d15a3088f147a87b64c7589eb662c9ac"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "pxfm"
 version = "0.1.29"
@@ -4342,6 +4451,12 @@ version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
+[[package]]
+name = "radium"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc33ff2d4973d518d823d61aa239014831e521c75da58e3df4840d3f47749d09"
+
 [[package]]
 name = "rand"
 version = "0.7.3"
@@ -4576,6 +4691,12 @@ dependencies = [
  "font-types 0.11.3",
 ]
 
+[[package]]
+name = "recvmsg"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3edd4d5d42c92f0a659926464d4cce56b562761267ecf0f469d85b7de384175"
+
 [[package]]
 name = "redox_syscall"
 version = "0.4.1"
@@ -4632,6 +4753,15 @@ version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"
 
+[[package]]
+name = "rend"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71fe3824f5629716b1589be05dacd749f6aa084c87e00e016714a8cdfccc997c"
+dependencies = [
+ "bytecheck",
+]
+
 [[package]]
 name = "renderdoc-sys"
 version = "1.1.0"
@@ -4705,6 +4835,35 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "rkyv"
+version = "0.7.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2297bf9c81a3f0dc96bc9521370b88f054168c29826a75e89c55ff196e7ed6a1"
+dependencies = [
+ "bitvec",
+ "bytecheck",
+ "bytes",
+ "hashbrown 0.12.3",
+ "ptr_meta",
+ "rend",
+ "rkyv_derive",
+ "seahash",
+ "tinyvec",
+ "uuid",
+]
+
+[[package]]
+name = "rkyv_derive"
+version = "0.7.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84d7b42d4b8d06048d3ac8db0eb31bcb942cbeb709f0b5f2b2ebde398d3038f5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "robust"
 version = "1.2.0"
@@ -4923,6 +5082,12 @@ dependencies = [
  "tiny-skia",
 ]
 
+[[package]]
+name = "seahash"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c107b6f4780854c8b126e228ea8869f4d7b71260f962fefb57b996b8959ba6b"
+
 [[package]]
 name = "selectors"
 version = "0.22.0"
@@ -5463,6 +5628,12 @@ dependencies = [
  "slotmap",
 ]
 
+[[package]]
+name = "tap"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
+
 [[package]]
 name = "tempfile"
 version = "3.27.0"
@@ -6627,6 +6798,12 @@ dependencies = [
  "safe_arch",
 ]
 
+[[package]]
+name = "widestring"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72069c3113ab32ab29e5584db3c6ec55d416895e60715417b5b883a357c3e471"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -6943,7 +7120,7 @@ version = "0.30.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6755fa58a9f8350bd1e472d4c3fcc25f824ec358933bba33306d0b63df5978d"
 dependencies = [
- "ahash",
+ "ahash 0.8.12",
  "android-activity",
  "atomic-waker",
  "bitflags 2.11.1",
@@ -7111,6 +7288,15 @@ dependencies = [
  "wasmparser",
 ]
 
+[[package]]
+name = "wyz"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
+dependencies = [
+ "tap",
+]
+
 [[package]]
 name = "x11-dl"
 version = "2.21.0"