Fix PROJ feature-mode handling

.devcontainer/Dockerfile

@@ -0,0 +1,17 @@
+FROM mcr.microsoft.com/devcontainers/rust:2-1-trixie
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        build-essential \
+        ca-certificates \
+        clang \
+        cmake \
+        curl \
+        git \
+        just \
+        libproj-dev \
+        libsqlite3-dev \
+        libtiff-dev \
+        pkg-config \
+        sqlite3 \
+    && rm -rf /var/lib/apt/lists/*

.devcontainer/devcontainer.json

@@ -1,35 +1,19 @@
-// For format details, see https://aka.ms/devcontainer.json. For config options, see the
-// README at: https://github.com/devcontainers/templates/tree/main/src/rust
 {
-	"name": "Rust",
-	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/rust:2-1-trixie",
-	// Use 'mounts' to make the cargo cache persistent in a Docker Volume.
+	"name": "Tyler Linux",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
 	"mounts": [
 		{
 			"source": "devcontainer-cargo-cache-${devcontainerId}",
 			"target": "/usr/local/cargo",
 			"type": "volume"
 		}
 	],
-	// Features to add to the dev container. More info: https://containers.dev/features.
-	"features": {
-		"ghcr.io/rocker-org/devcontainer-features/apt-packages:1": {
-			"packages": "libproj25,libproj-dev,libtiff6,sqlite3,curl,clang,just"
-		}
-	},
-	// Use 'forwardPorts' to make a list of ports inside the container available locally.
-	// "forwardPorts": [],
-
-	// Use 'postCreateCommand' to run commands after the container is created.
 	"postCreateCommand": "rustc --version",
-	// Configure tool-specific properties.
 	"customizations": {
 		"jetbrains": {
 			"backend": "RustRover"
 		}
 	}
-
-	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
-	// "remoteUser": "root"
 }

.github/workflows/ci.yml

@@ -9,15 +9,69 @@ on:
 
 jobs:
   ci-check:
-    runs-on: ubuntu-latest
+    name: ${{ matrix.os }} / ${{ matrix.mode }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        mode: [proj-system, proj-bundled]
+        include:
+          - mode: proj-system
+            recipe: ci-check-system
+          - mode: proj-bundled
+            recipe: ci-check-bundled
     steps:
       - uses: actions/checkout@v6
-      - name: Install native dependencies
+
+      - name: Install Linux native dependencies
+        if: runner.os == 'Linux'
         run: |
           sudo apt-get update
-          sudo apt-get install -y --no-install-recommends libtiff-dev
+          sudo apt-get install -y --no-install-recommends \
+            clang \
+            cmake \
+            libproj-dev \
+            libsqlite3-dev \
+            libtiff-dev \
+            pkg-config \
+            sqlite3
+
+      - name: Install macOS native dependencies
+        if: runner.os == 'macOS'
+        run: brew install proj sqlite libtiff pkg-config
+
+      - name: Install Windows native dependencies
+        if: runner.os == 'Windows'
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: UCRT64
+          update: true
+          install: >-
+            git
+            mingw-w64-ucrt-x86_64-clang
+            mingw-w64-ucrt-x86_64-cmake
+            mingw-w64-ucrt-x86_64-just
+            mingw-w64-ucrt-x86_64-sqlite3
+            mingw-w64-ucrt-x86_64-libtiff
+            mingw-w64-ucrt-x86_64-make
+            mingw-w64-ucrt-x86_64-pkgconf
+            mingw-w64-ucrt-x86_64-proj
+            mingw-w64-ucrt-x86_64-rust
+
       - uses: extractions/setup-just@v4
+        if: runner.os != 'Windows'
+
       - uses: dtolnay/rust-toolchain@stable
+        if: runner.os != 'Windows'
         with:
           components: clippy, rustfmt
-      - run: just ci-check
+
+      - name: Run validation
+        if: runner.os != 'Windows'
+        run: just ${{ matrix.recipe }}
+
+      - name: Run validation
+        if: runner.os == 'Windows'
+        shell: msys2 {0}
+        run: just ${{ matrix.recipe }}

CHANGELOG.md

@@ -1,5 +1,36 @@
 # Changelog
 
+## Unreleased
+
+### Changed
+
+- Tyler and `cityjson-convert` now use `cityjson_lib::ops::Transformer` for PROJ
+  coordinate transformations instead of maintaining local PROJ wrappers.
+- Tyler resolves `cityjson-lib`, `cityjson-types`, and `cityjson-json` through
+  the local `cityjson-rs` checkout while depending on the new `cityjson-lib`
+  `proj` feature.
+- Tyler and `cityjson-convert` now expose explicit `proj-system` and
+  `proj-bundled` build modes, with system builds using native PROJ networking
+  capability and bundled builds kept separate from it.
+- The build documentation now distinguishes reproducible/offline packaged
+  grids from opt-in native PROJ network fetching and documents the local cache
+  behavior used for downloaded grid chunks.
+- Linux, macOS, and Windows CI now validate both PROJ build modes, and the
+  devcontainer installs the native PROJ toolchain used for repeatable local
+  validation.
+
+### Added
+
+- Feature-resolution checks that verify system mode does not activate bundled
+  PROJ and bundled mode does not imply native PROJ networking.
+
+### Removed
+
+- Removed Tyler's direct `proj-sys`, `libc`, `num-traits`, and `thiserror`
+  dependencies that only supported the deleted local PROJ wrappers.
+- Removed the duplicate local PROJ wrapper modules from Tyler and
+  `cityjson-convert`.
+
 ## tyler 0.4.1 (2026-04-30)
 
 The main features of the new version: