diff --git a/.clangd b/.clangd
new file mode 100644
index 0000000..28b5a38
--- /dev/null
+++ b/.clangd
@@ -0,0 +1,7 @@
+CompileFlags:
+  Remove:
+    - -mlongcalls
+    - -fno-shrink-wrap
+    - -fstrict-volatile-bitfields
+    - -fno-tree-switch-conversion
+    - -fanalyzer
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 611bfe3..b42d0c9 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -5,7 +5,17 @@
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
 	"image": "mcr.microsoft.com/devcontainers/base:alpine-3.22",
 	// Features to add to the dev container. More info: https://containers.dev/features.
-	"features": {},
+	"features": {
+		"ghcr.io/anthropics/devcontainer-features/claude-code:1": {}
+	},
+	"mounts": [
+		"source=${localEnv:HOME}/.claude,target=/home/vscode/.claude,type=bind,consistency=cached",
+		// ~/.claude/skills/* are symlinks into ~/.agents/skills — mount it too or they dangle
+		"source=${localEnv:HOME}/.agents,target=/home/vscode/.agents,type=bind,consistency=cached"
+	],
+	"containerEnv": {
+		"CLAUDE_CONFIG_DIR": "/home/vscode/.claude"
+	},
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
 	// Use 'postCreateCommand' to run commands after the container is created.
@@ -17,28 +27,22 @@
 			"extensions": [
 				"ms-vscode.cpptools-extension-pack",
 				"rockcat.avr-support",
-				"harikrishnan94.cxx-compiler-explorer"
+				"harikrishnan94.cxx-compiler-explorer",
+				"llvm-vs-code-extensions.vscode-clangd",
+				"Anthropic.claude-code"
 			],
 			"settings": {
-				"editor.formatOnSave": true,
-				"C_Cpp.codeAnalysis.clangTidy.checks.disabled": [
-					"clang-analyzer-core.NullDereference"
-				],
-				"C_Cpp.files.exclude": {
-					"build/**": true
-				},
 				"files.associations": {
 					"*.S": "avr"
 				},
-				"cmake.configureOnOpen": true,
-				"compilerexplorer.compilationDirectory": "${workspaceFolder}/build"
+				"clangd.path": "/usr/bin/clangd"
 			}
 		}
-	}
-	// "runArgs": [
-	// 	"--device=/dev/ttyUSB0",
-	// 	"--device=/dev/ttyUSB1"
-	// ]
+	},
+	"runArgs": [
+		"--device=/dev/ttyUSB0",
+		"--network=host"
+	]
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
 	// "remoteUser": "root"
 }
diff --git a/scripts/install-toolchain.sh b/scripts/install-toolchain.sh
index 4c1f97d..b876b61 100644
--- a/scripts/install-toolchain.sh
+++ b/scripts/install-toolchain.sh
@@ -1,2 +1,2 @@
-sudo apk add make cmake avrdude avr-libc gcc-avr tshark
+sudo apk add make cmake avrdude avr-libc gcc-avr tshark clang-extra-tools
 
diff --git a/src/avclan/bus.cc b/src/avclan/bus.cc
index 3ced901..9528c41 100644
--- a/src/avclan/bus.cc
+++ b/src/avclan/bus.cc
@@ -375,10 +375,6 @@ auto Bus::send(const Frame &out, Frame::Print print) -> Send {
     }
 
     for (uint8_t i = 0; i < out.length; i++) {
-      // Based on the µPD6708 datasheet, ACK bit for broadcast doesn't seem
-      // necessary (i.e. This deviates from the previous broadcast specific
-      // function that sent an extra `1` bit after each byte/parity)
-      // Explanation for why audio-group broadcast state report isn't working?
       if (auto serr = handle.send<8>(out.data[i], with_ack, out.is_unicast);
           serr == NAK) {
         err.errno = NAK_DATA;
diff --git a/src/avclan/target/avr-attiny3216/phy_avr.c b/src/avclan/target/avr-attiny3216/phy_avr.c
index 1bdb29a..230dd29 100644
--- a/src/avclan/target/avr-attiny3216/phy_avr.c
+++ b/src/avclan/target/avr-attiny3216/phy_avr.c
@@ -15,7 +15,7 @@
 
 // F_CPU + TICK_US (timing.h) defined here; F_CPU potentially needed by
 // avr-libc.
-#include "timing_avr.h"
+#include "timing_avr.h" // IWYU pragma: keep
 
 // USART0 TX ring indices owned by the jnk0le lib; the guard consults them to
 // decide whether to resume the TX drain (DRE interrupt) on leave.
@@ -80,7 +80,7 @@ bool phy_is_muted() {
 }
 
 // True when the bus is being driven (i.e. not idle/floating).
-bool phy_active() { return !BUS_IS_IDLE; }
+bool phy_active() { return (!BUS_IS_IDLE) != 0; }
 
 // Mute device TX on AVCLAN bus
 void phy_mute(bool mute) {
@@ -112,8 +112,6 @@ static void set_AVC_logic_for(uint8_t val, uint16_t period) {
     AVCLAN_setBusDriven();
   }
   while (TCB1.CNT <= period) {};
-
-  return;
 }
 
 void phy_send_bit(Bit bit) {
@@ -481,6 +479,8 @@ void phy_guard_leave() {
 }
 
 #if !defined(NDEBUG) && defined(MEASURE_BUS)
+  #include <stdio.h> // phy_measure() reporting (debug builds only)
+
   // Only used immediately below
   #define XSTR(x) #x
   #define STR(x)  XSTR(x)
diff --git a/src/avclan/target/avr-attiny3216/timing_avr.h b/src/avclan/target/avr-attiny3216/timing_avr.h
index 37424cb..fe140eb 100644
--- a/src/avclan/target/avr-attiny3216/timing_avr.h
+++ b/src/avclan/target/avr-attiny3216/timing_avr.h
@@ -63,4 +63,4 @@
 // TCB_TICK is nanoseconds/tick; the generic timing.h wants microseconds/tick.
 #define TICK_US (TCB_TICK / 1000.0)
 
-#include "timing.h"
+#include "timing.h" // IWYU pragma: export