refactor: move dimos-viewer to dedicated dimos/ directory (#7)

Move all DimOS-specific code out of examples/rust/custom_callback/ into
a top-level dimos/ directory. Restore custom_callback to its upstream
Rerun state for easier future merges.

Directory structure:
  dimos/
    Cargo.toml        (dimos-viewer crate)
    pyproject.toml    (maturin packaging)
    dimos_viewer/     (Python wrapper)
    tests/            (Python tests)
    src/
      viewer.rs       (main binary with CLI args)
      lib.rs
      interaction/    (LCM transport module)

Changes:
- Created dimos/ crate with all viewer + LCM code
- Restored examples/rust/custom_callback/ to upstream Rerun state
- Updated CI workflow to reference dimos/ instead of custom_callback
- Added dimos/ to workspace members
- Both crates compile and test independently

Verified:
- cargo check -p dimos-viewer ✓
- cargo test -p dimos-viewer ✓ (13 tests pass)
- cargo check -p custom_callback ✓ (upstream intact)
- dimos-viewer --help shows correct CLI args

Author: spomichter

.github/workflows/build-viewer.yml

@@ -37,7 +37,7 @@ defaults:
 
 env:
   PYTHON_VERSION: "3.10"
-  PACKAGE_DIR: examples/rust/custom_callback
+  PACKAGE_DIR: dimos
 
 # ---------------------------------------------------------------------------
 jobs:
@@ -74,8 +74,8 @@ jobs:
             target/
           key: ${{ runner.os }}-cargo-check-${{ hashFiles('**/Cargo.lock') }}
 
-      - run: cargo check -p custom_callback
-      - run: cargo test  -p custom_callback
+      - run: cargo check -p dimos-viewer
+      - run: cargo test  -p dimos-viewer
 
   # -------------------------------------------------------------------
   # 2. Build wheels per platform

Cargo.lock

@@ -2227,7 +2227,6 @@ name = "custom_callback"
 version = "0.30.0-alpha.1+dev"
 dependencies = [
  "bincode",
- "clap",
  "mimalloc",
  "parking_lot",
  "rerun",
@@ -3109,6 +3108,19 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "dimos-viewer"
+version = "0.30.0-alpha.1+dev"
+dependencies = [
+ "bincode",
+ "clap",
+ "mimalloc",
+ "parking_lot",
+ "rerun",
+ "serde",
+ "tokio",
+]
+
 [[package]]
 name = "directories"
 version = "6.0.0"

Cargo.toml

@@ -7,6 +7,7 @@ members = [
   "crates/utils/*",
   "crates/viewer/*",
   "docs/snippets",
+  "dimos",
   "examples/rust/*",
   "rerun_py",
   "run_wasm",

dimos/Cargo.toml

@@ -0,0 +1,42 @@
+[package]
+name = "dimos-viewer"
+version = "0.30.0-alpha.1+dev"
+edition = "2024"
+rust-version = "1.92"
+license = "MIT OR Apache-2.0"
+publish = false
+description = "DimOS Interactive Viewer — custom Rerun viewer with LCM click-to-navigate"
+
+[[bin]]
+name = "dimos-viewer"
+path = "src/viewer.rs"
+
+[lib]
+name = "dimos_viewer"
+path = "src/lib.rs"
+
+[features]
+default = []
+analytics = ["rerun/analytics"]
+
+[dependencies]
+rerun = { path = "../crates/top/rerun", default-features = false, features = [
+  "native_viewer",
+  "run",
+  "server",
+] }
+
+clap = { workspace = true, features = ["derive"] }
+bincode.workspace = true
+mimalloc.workspace = true
+parking_lot.workspace = true
+serde = { workspace = true, features = ["derive"] }
+tokio = { workspace = true, features = [
+  "io-util",
+  "macros",
+  "net",
+  "rt-multi-thread",
+  "signal",
+  "sync",
+  "time",
+] }