diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..a71e64a
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,29 @@
+version: 2
+
+updates:
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      rust-dependencies:
+        patterns:
+          - "*"
+
+  - package-ecosystem: npm
+    directory: /npm
+    schedule:
+      interval: weekly
+    groups:
+      npm-dependencies:
+        patterns:
+          - "*"
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      github-actions:
+        patterns:
+          - "*"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fb65f45..ceb73e0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,42 +49,45 @@ jobs:
             ~/.cargo/registry/index/
             ~/.cargo/registry/cache/
             ~/.cargo/git/db/
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml', 'Cargo.lock') }}
           restore-keys: ${{ runner.os }}-cargo-
 
       - name: Cache build artifacts
         uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
           path: target/
-          key: ${{ runner.os }}-build-ci-${{ hashFiles('**/Cargo.toml') }}-${{ hashFiles('**/*.rs') }}
+          key: ${{ runner.os }}-build-ci-${{ hashFiles('**/Cargo.toml', 'Cargo.lock') }}-${{ hashFiles('**/*.rs') }}
           restore-keys: |
-            ${{ runner.os }}-build-ci-${{ hashFiles('**/Cargo.toml') }}-
+            ${{ runner.os }}-build-ci-${{ hashFiles('**/Cargo.toml', 'Cargo.lock') }}-
             ${{ runner.os }}-build-ci-
 
       - name: Check dependency isolation
         run: |
-          if cargo tree -p agent-desktop-core 2>/dev/null | grep -E 'agent-desktop-(macos|windows|linux)'; then
+          if cargo tree --locked -p agent-desktop-core 2>/dev/null | grep -E 'agent-desktop-(macos|windows|linux)'; then
             echo "FAIL: core crate depends on platform crates"
             exit 1
           fi
           echo "OK: core crate has no platform dependencies"
 
       - name: Clippy
-        run: cargo clippy --all-targets -- -D warnings
+        run: cargo clippy --locked --all-targets -- -D warnings
 
       - name: Unit tests
-        run: cargo test --lib --workspace
+        run: cargo test --locked --lib --workspace
+
+      - name: Binary command tests
+        run: cargo test --locked -p agent-desktop
 
       # The FFI crate ships integration harnesses under crates/ffi/tests/ that
       # exercise the C-ABI from outside the crate (raw extern "C" decls, enum
       # fuzzing, out-param zeroing, last-error lifetimes). The workspace --lib
       # run skips them, so wire them in explicitly so regressions fail PR CI.
       - name: FFI integration tests
-        run: cargo test -p agent-desktop-ffi --tests
+        run: cargo test --locked -p agent-desktop-ffi --tests
 
       # Use the ci profile (no LTO, opt-level 1) — fast compile, still checks the binary builds.
       - name: Build binary (ci profile)
-        run: cargo build --profile ci
+        run: cargo build --locked --profile ci
 
       - name: Check binary size
         run: |
@@ -98,7 +101,7 @@ jobs:
           echo "OK: binary within 15MB limit"
 
       - name: FFI cdylib build (release-ffi profile)
-        run: cargo build --profile release-ffi -p agent-desktop-ffi
+        run: cargo build --locked --profile release-ffi -p agent-desktop-ffi
 
       - name: FFI header drift check
         run: |
@@ -122,3 +125,32 @@ jobs:
             exit 1
           fi
           echo "OK: FFI header is in sync with source"
+
+      - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
+        with:
+          node-version: '24'
+
+      - name: NPM package contents
+        run: node scripts/check-npm-package.js
+
+      - name: NPM wrapper smoke
+        run: |
+          case "$(uname -s)-$(uname -m)" in
+            Darwin-arm64) NAME=agent-desktop-darwin-arm64 ;;
+            Darwin-x86_64) NAME=agent-desktop-darwin-x64 ;;
+            *)
+              echo "Unsupported smoke-test platform: $(uname -s)-$(uname -m)"
+              exit 1
+              ;;
+          esac
+          trap 'rm -f "npm/bin/${NAME}"' EXIT
+          cp target/ci/agent-desktop "npm/bin/${NAME}"
+          chmod +x "npm/bin/${NAME}"
+          node npm/bin/agent-desktop.js version --json > /tmp/agent-desktop-version.json
+          node -e "
+            const out = require('fs').readFileSync('/tmp/agent-desktop-version.json', 'utf8');
+            const json = JSON.parse(out);
+            if (json.ok !== true || !json.data || typeof json.data.version !== 'string') {
+              throw new Error('agent-desktop npm wrapper did not return version JSON');
+            }
+          "
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 14064d1..dfab872 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -64,11 +64,11 @@ jobs:
             ~/.cargo/registry/index/
             ~/.cargo/registry/cache/
             ~/.cargo/git/db/
-          key: ${{ runner.os }}-${{ matrix.target }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+          key: ${{ runner.os }}-${{ matrix.target }}-cargo-${{ hashFiles('**/Cargo.toml', 'Cargo.lock') }}
           restore-keys: ${{ runner.os }}-${{ matrix.target }}-cargo-
 
       - name: Build release binary
-        run: cargo build --release --target ${{ matrix.target }}
+        run: cargo build --locked --release --target ${{ matrix.target }}
 
       - name: Check binary size
         run: |
@@ -147,11 +147,11 @@ jobs:
             ~/.cargo/registry/index/
             ~/.cargo/registry/cache/
             ~/.cargo/git/db/
-          key: ${{ runner.os }}-${{ matrix.target }}-ffi-cargo-${{ hashFiles('**/Cargo.toml') }}
+          key: ${{ runner.os }}-${{ matrix.target }}-ffi-cargo-${{ hashFiles('**/Cargo.toml', 'Cargo.lock') }}
           restore-keys: ${{ runner.os }}-${{ matrix.target }}-ffi-cargo-
 
       - name: Build FFI cdylib (release-ffi profile)
-        run: cargo build --profile release-ffi -p agent-desktop-ffi --target ${{ matrix.target }}
+        run: cargo build --locked --profile release-ffi -p agent-desktop-ffi --target ${{ matrix.target }}
 
       # build.rs bakes install_name=@rpath/... ; a regression here silently
       # breaks Swift/SPM consumers, so verify before shipping.
@@ -235,7 +235,7 @@ jobs:
 
       - name: Create checksums file
         run: |
-          cat *.sha256 > checksums.txt
+          cat ./*.sha256 > checksums.txt
           cat checksums.txt
 
       - name: Upload assets to GitHub Release
@@ -244,7 +244,7 @@ jobs:
           GH_REPO: ${{ github.repository }}
         run: |
           gh release upload ${{ needs.release-please.outputs.tag_name }} \
-            *.tar.gz *.zip checksums.txt \
+            ./*.tar.gz ./*.zip checksums.txt \
             --clobber
 
       # Keyless Sigstore provenance. Verify with:
diff --git a/.github/workflows/supply-chain.yml b/.github/workflows/supply-chain.yml
new file mode 100644
index 0000000..1fab0b7
--- /dev/null
+++ b/.github/workflows/supply-chain.yml
@@ -0,0 +1,42 @@
+name: Supply Chain
+
+on:
+  pull_request:
+  push:
+    branches: [main, master]
+  schedule:
+    - cron: '37 9 * * 1'
+  workflow_dispatch:
+
+concurrency:
+  group: supply-chain-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions: {}
+
+jobs:
+  audit:
+    name: Audit
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cargo dependency policy
+        uses: EmbarkStudios/cargo-deny-action@6c8f9facfa5047ec02d8485b6bf52b587b7777d1 # v2.0.18
+        with:
+          command: check
+          arguments: --locked
+          command-arguments: advisories licenses bans sources
+
+      - name: Workflow security audit
+        uses: zizmorcore/zizmor-action@5f14fd08f7cf1cb1609c1e344975f152c7ee938d # v0.5.6
+        with:
+          version: 1.25.2
+          persona: regular
+          min-severity: medium
+          min-confidence: high
+          advanced-security: false
+          inputs: .github/workflows
diff --git a/.gitignore b/.gitignore
index c7f0313..3900c96 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,8 +3,7 @@
 **/*.rs.bk
 
 # Cargo
-Cargo.lock
-!crates/*/Cargo.lock
+!Cargo.lock
 
 # macOS
 .DS_Store
@@ -78,4 +77,4 @@ docs/*
 !docs/solutions/**
 todos/
 .cursor/
-.context/
\ No newline at end of file
+.context/
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..c353476
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,970 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "accessibility-sys"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46a6a8e90a1d8b96a48249e7c8f5b4058447bea8847280db7bfccb6dcab6b8e1"
+dependencies = [
+ "core-foundation-sys",
+]
+
+[[package]]
+name = "agent-desktop"
+version = "0.1.14"
+dependencies = [
+ "agent-desktop-core",
+ "agent-desktop-linux",
+ "agent-desktop-macos",
+ "agent-desktop-windows",
+ "clap",
+ "serde",
+ "serde_json",
+ "thiserror",
+ "tracing",
+ "tracing-subscriber",
+]
+
+[[package]]
+name = "agent-desktop-core"
+version = "0.1.14"
+dependencies = [
+ "base64",
+ "libc",
+ "rustc-hash",
+ "serde",
+ "serde_json",
+ "smallvec",
+ "thiserror",
+ "tracing",
+]
+
+[[package]]
+name = "agent-desktop-ffi"
+version = "0.1.14"
+dependencies = [
+ "agent-desktop-core",
+ "agent-desktop-linux",
+ "agent-desktop-macos",
+ "agent-desktop-windows",
+ "cbindgen",
+ "libc",
+ "smallvec",
+]
+
+[[package]]
+name = "agent-desktop-linux"
+version = "0.1.14"
+dependencies = [
+ "agent-desktop-core",
+ "thiserror",
+]
+
+[[package]]
+name = "agent-desktop-macos"
+version = "0.1.14"
+dependencies = [
+ "accessibility-sys",
+ "agent-desktop-core",
+ "base64",
+ "core-foundation",
+ "core-foundation-sys",
+ "core-graphics",
+ "rustc-hash",
+ "serde",
+ "serde_json",
+ "smallvec",
+ "thiserror",
+ "tracing",
+]
+
+[[package]]
+name = "agent-desktop-windows"
+version = "0.1.14"
+dependencies = [
+ "agent-desktop-core",
+ "thiserror",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddd31a130427c27518df266943a5308ed92d4b226cc639f5a8f1002816174301"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anstream"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43d5b281e737544384e969a5ccad3f1cdd24b48086a0fc1b2a5262a26b8f4f4a"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5192cca8006f1fd4f7237516f40fa183bb07f8fbdfedaa0036de5ea9b0b45e78"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e7644824f0aa2c7b9384579234ef10eb7efb6a0deb83f9630a49594dd9c15c2"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
+dependencies = [
+ "anstyle",
+ "once_cell_polyfill",
+ "windows-sys",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.102"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
+
+[[package]]
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+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
+[[package]]
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+
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+checksum = "befbfd072a8e81c02f8c507aefce431fe5e7d051f83d48a23ffc9b9fe5a11799"
+dependencies = [
+ "clap",
+ "heck",
+ "indexmap",
+ "log",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "serde_json",
+ "syn",
+ "tempfile",
+ "toml",
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+ "hashbrown 0.17.0",
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+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..148d85a
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,15 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities through GitHub private vulnerability reporting for this repository.
+
+Do not open a public issue for suspected vulnerabilities. Include the affected version or commit, reproduction steps, expected impact, and any relevant logs or proof-of-concept details.
+
+## Scope
+
+Security reports are in scope for the CLI, npm installer, FFI boundary, release artifacts, GitHub Actions workflows, and platform adapters.
+
+## Response
+
+Maintainers will review private vulnerability reports, coordinate fixes, and publish security advisories when a vulnerability affects released versions.
diff --git a/deny.toml b/deny.toml
new file mode 100644
index 0000000..dd15514
--- /dev/null
+++ b/deny.toml
@@ -0,0 +1,25 @@
+[advisories]
+version = 2
+yanked = "deny"
+
+[licenses]
+version = 2
+confidence-threshold = 0.8
+allow = [
+  "Apache-2.0",
+  "Apache-2.0 WITH LLVM-exception",
+  "MIT",
+  "MPL-2.0",
+  "Unicode-3.0",
+  "Unlicense",
+]
+
+[bans]
+multiple-versions = "allow"
+wildcards = "allow"
+highlight = "all"
+
+[sources]
+unknown-registry = "deny"
+unknown-git = "deny"
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
diff --git a/npm/scripts/postinstall.js b/npm/scripts/postinstall.js
index 4925d77..7e2901b 100644
--- a/npm/scripts/postinstall.js
+++ b/npm/scripts/postinstall.js
@@ -4,7 +4,7 @@ const { existsSync, mkdirSync, chmodSync, unlinkSync, renameSync, writeFileSync,
 const { readFileSync } = require('fs');
 const { join } = require('path');
 const { platform, arch } = require('os');
-const { execSync } = require('child_process');
+const { execFileSync } = require('child_process');
 const { createHash } = require('crypto');
 
 const projectRoot = join(__dirname, '..');
@@ -43,7 +43,7 @@ function getPlatformKey() {
 function download(url, dest) {
   const tmpDest = dest + '.tmp';
   try {
-    execSync(`curl -fsSL --retry 3 --retry-delay 2 -o "${tmpDest}" "${url}"`, {
+    execFileSync('curl', ['-fsSL', '--retry', '3', '--retry-delay', '2', '-o', tmpDest, url], {
       stdio: 'pipe',
       timeout: 60000,
     });
@@ -65,7 +65,7 @@ function fixGlobalInstallBin() {
 
   let npmBinDir;
   try {
-    const prefix = execSync('npm prefix -g', { encoding: 'utf8', timeout: 5000 }).trim();
+    const prefix = execFileSync('npm', ['prefix', '-g'], { encoding: 'utf8', timeout: 5000 }).trim();
     npmBinDir = join(prefix, 'bin');
   } catch {
     return;
@@ -169,27 +169,20 @@ function main() {
 
   try {
     download(tarballUrl, tarballPath);
-
-    try {
-      download(checksumsUrl, checksumsPath);
-      const checksums = readFileSync(checksumsPath, 'utf8');
-      const expectedLine = checksums.split('\n').find((line) => line.includes(tarball));
-      if (expectedLine) {
-        const expectedHash = expectedLine.split(/\s+/)[0];
-        if (!verifyChecksum(tarballPath, expectedHash)) {
-          log('WARNING: Checksum verification failed.');
-          unlinkSync(tarballPath);
-          unlinkSync(checksumsPath);
-          return;
-        }
-        log('Checksum verified');
-      }
-      unlinkSync(checksumsPath);
-    } catch {
-      log('Checksum verification skipped');
+    download(checksumsUrl, checksumsPath);
+    const checksums = readFileSync(checksumsPath, 'utf8');
+    const expectedLine = checksums.split('\n').find((line) => line.includes(tarball));
+    if (!expectedLine) {
+      throw new Error(`Checksum entry missing for ${tarball}`);
     }
+    const expectedHash = expectedLine.split(/\s+/)[0];
+    if (!verifyChecksum(tarballPath, expectedHash)) {
+      throw new Error('Checksum verification failed');
+    }
+    unlinkSync(checksumsPath);
+    log('Checksum verified');
 
-    execSync(`tar -xzf "${tarballPath}" -C "${binDir}"`, { stdio: 'pipe' });
+    execFileSync('tar', ['-xzf', tarballPath, '-C', binDir], { stdio: 'pipe' });
 
     const extractedBinary = join(binDir, 'agent-desktop');
     if (existsSync(extractedBinary) && extractedBinary !== binaryPath) {
@@ -208,6 +201,7 @@ function main() {
 
     try { if (existsSync(tarballPath)) unlinkSync(tarballPath); } catch {}
     try { if (existsSync(checksumsPath)) unlinkSync(checksumsPath); } catch {}
+    process.exitCode = 1;
     return;
   }
 
diff --git a/scripts/check-npm-package.js b/scripts/check-npm-package.js
new file mode 100644
index 0000000..ef230f8
--- /dev/null
+++ b/scripts/check-npm-package.js
@@ -0,0 +1,39 @@
+#!/usr/bin/env node
+
+const { execFileSync } = require('child_process');
+const { join } = require('path');
+
+const root = join(__dirname, '..');
+const npmDir = join(root, 'npm');
+const expectedFiles = [
+  'bin/agent-desktop.js',
+  'package.json',
+  'scripts/postinstall.js',
+];
+
+const output = execFileSync('npm', ['pack', '--dry-run', '--json'], {
+  cwd: npmDir,
+  encoding: 'utf8',
+  env: {
+    ...process.env,
+    npm_config_cache: process.env.npm_config_cache || '/tmp/agent-desktop-npm-cache',
+  },
+});
+
+const pack = JSON.parse(output)[0];
+const actualFiles = pack.files.map((file) => file.path).sort();
+const expected = [...expectedFiles].sort();
+
+if (JSON.stringify(actualFiles) !== JSON.stringify(expected)) {
+  throw new Error(`Unexpected npm package contents: ${actualFiles.join(', ')}`);
+}
+
+if (pack.bundled && pack.bundled.length > 0) {
+  throw new Error(`npm package unexpectedly bundles dependencies: ${pack.bundled.join(', ')}`);
+}
+
+if (pack.unpackedSize > 25_000) {
+  throw new Error(`npm package is unexpectedly large: ${pack.unpackedSize} bytes`);
+}
+
+console.log(`OK: npm package contains ${actualFiles.length} files, ${pack.unpackedSize} bytes unpacked`);