diff --git a/.github/workflows/build-desktop-dev.yml b/.github/workflows/build-desktop-dev.yml
index f734005b..47bbf421 100644
--- a/.github/workflows/build-desktop-dev.yml
+++ b/.github/workflows/build-desktop-dev.yml
@@ -103,6 +103,7 @@ jobs:
       - name: Build renderer and Electron bundles
         working-directory: desktop
         run: |
+          bun run build:plugin-seed
           bun run build
           bun run build:electron
 
diff --git a/.github/workflows/release-desktop.yml b/.github/workflows/release-desktop.yml
index 9ceff66e..8ad47a8a 100644
--- a/.github/workflows/release-desktop.yml
+++ b/.github/workflows/release-desktop.yml
@@ -155,6 +155,7 @@ jobs:
       - name: Build renderer and Electron bundles
         working-directory: desktop
         run: |
+          bun run build:plugin-seed
           bun run build
           bun run build:electron
 
diff --git a/scripts/pr/release-workflow.test.ts b/scripts/pr/release-workflow.test.ts
index 50b925f2..bd01f6c3 100644
--- a/scripts/pr/release-workflow.test.ts
+++ b/scripts/pr/release-workflow.test.ts
@@ -43,6 +43,12 @@ describe('release desktop workflow', () => {
 
       expect(workflow).toContain('Build Electron')
       expect(workflow).toContain('smoke_platform')
+      // The packaged app must ship the cc-haha-builtin plugin seed. The
+      // release build inlines electron:build's steps rather than calling the
+      // script, so build:plugin-seed has to be listed explicitly here — a
+      // prior drift dropped it and shipped seedless v0.5.12/v0.5.13 packages
+      // (reverse-engineering / image-gen "not found in marketplace").
+      expect(workflow).toContain('bun run build:plugin-seed')
       expect(workflow).toContain('bun run test:package-smoke --platform ${{ matrix.smoke_platform }} --package-kind release --artifacts-dir desktop/build-artifacts/electron')
       expect(workflow).not.toContain('tauri-apps/tauri-action@v0')
     }
diff --git a/scripts/quality-gate/package-smoke/index.test.ts b/scripts/quality-gate/package-smoke/index.test.ts
index 98c2aade..c105b69a 100644
--- a/scripts/quality-gate/package-smoke/index.test.ts
+++ b/scripts/quality-gate/package-smoke/index.test.ts
@@ -71,6 +71,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/dist/index.html')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-apple-darwin')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/spawn-helper')
     writeFile(rootDir, 'desktop/build-artifacts/electron/Claude-Code-Haha-0.3.1-arm64.zip')
@@ -108,6 +109,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-apple-darwin')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/spawn-helper')
 
@@ -127,6 +129,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-apple-darwin')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/spawn-helper')
     writeFile(rootDir, 'desktop/build-artifacts/electron/Claude Code Haha-0.3.1-arm64-mac.zip')
@@ -147,6 +150,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-apple-darwin')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/spawn-helper')
     writeFile(rootDir, 'desktop/build-artifacts/electron/Claude-Code-Haha-0.3.1-arm64.zip')
@@ -173,6 +177,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-apple-darwin')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/spawn-helper')
     writeFile(rootDir, 'desktop/build-artifacts/electron/Claude-Code-Haha-0.3.1-arm64.zip')
@@ -193,6 +198,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-apple-darwin')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/spawn-helper')
 
@@ -232,6 +238,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-apple-darwin')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/mac-arm64/Claude Code Haha.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty/prebuilds/darwin-arm64/spawn-helper')
 
@@ -276,6 +283,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-x86_64-pc-windows-msvc.exe')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/win32-x64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/latest.yml', 'path: Claude Code Haha Setup 0.3.1.exe\n')
 
@@ -296,6 +304,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/windows-x64/win-unpacked/resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/windows-x64/win-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-x86_64-pc-windows-msvc.exe')
     writeFile(rootDir, 'desktop/build-artifacts/windows-x64/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/windows-x64/win-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/windows-x64/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/win32-x64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/windows-x64/latest.yml', 'path: Claude-Code-Haha-0.3.1-x64.exe\n')
 
@@ -317,6 +326,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-x86_64-pc-windows-msvc.exe')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/win32-x64/pty.node')
 
     const report = await inspectPackagedArtifacts(rootDir, { platform: 'windows', packageKind: 'dir' })
@@ -335,6 +345,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-x86_64-pc-windows-msvc.exe')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/win-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/win32-x64/pty.node')
 
     const report = await inspectPackagedArtifacts(rootDir, { platform: 'windows', packageKind: 'release' })
@@ -354,6 +365,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/linux-x64/linux-unpacked/resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/linux-x64/linux-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-x86_64-unknown-linux-gnu')
     writeFile(rootDir, 'desktop/build-artifacts/linux-x64/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/linux-x64/linux-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/linux-x64/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/linux-x64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/linux-x64/latest-linux.yml', 'path: Claude-Code-Haha-0.3.1-x64.AppImage\n')
 
@@ -378,6 +390,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/linux-arm64/linux-unpacked/resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/linux-arm64/linux-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-unknown-linux-gnu')
     writeFile(rootDir, 'desktop/build-artifacts/linux-arm64/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/linux-arm64/linux-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/linux-arm64/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/linux-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/linux-arm64/latest-linux-arm64.yml', 'path: Claude-Code-Haha-0.3.1-arm64.AppImage\n')
 
@@ -402,6 +415,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-x86_64-unknown-linux-gnu')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/build/Release/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/latest-linux.yml', 'path: Claude-Code-Haha-0.3.1-linux-x86_64.AppImage\n')
 
@@ -425,6 +439,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-arm64-unpacked/resources/app-update.yml')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-arm64-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-aarch64-unknown-linux-gnu')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-arm64-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/linux-arm64-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-arm64-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/linux-arm64/pty.node')
     writeFile(rootDir, 'desktop/build-artifacts/electron/latest-linux-arm64.yml', 'path: Claude-Code-Haha-0.3.1-linux-arm64.AppImage\n')
 
@@ -445,6 +460,7 @@ describe('packaged artifact inspection', () => {
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/src-tauri/binaries/claude-sidecar-x86_64-unknown-linux-gnu')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/package.json')
+    writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/plugin-seed/marketplaces/cc-haha-builtin/.claude-plugin/marketplace.json')
     writeFile(rootDir, 'desktop/build-artifacts/electron/linux-unpacked/resources/app.asar.unpacked/node_modules/node-pty/prebuilds/linux-x64/pty.node')
 
     const report = await inspectPackagedArtifacts(rootDir, { platform: 'linux', packageKind: 'dir' })
diff --git a/scripts/quality-gate/package-smoke/index.ts b/scripts/quality-gate/package-smoke/index.ts
index c70206a8..6b8da6a9 100644
--- a/scripts/quality-gate/package-smoke/index.ts
+++ b/scripts/quality-gate/package-smoke/index.ts
@@ -505,6 +505,12 @@ function inspectMacosArtifacts(rootDir: string, report: PackageSmokeReport, opti
     releaseMode,
   )
   addPresenceCheck(report, rootDir, 'macOS node-pty package.json', join(nodePtyDir, 'package.json'))
+  addPresenceCheck(
+    report,
+    rootDir,
+    'macOS unpacked cc-haha-builtin plugin seed',
+    join(unpackedDir, 'plugin-seed', 'marketplaces', 'cc-haha-builtin', '.claude-plugin', 'marketplace.json'),
+  )
   addMatchCheck(
     report,
     rootDir,
@@ -592,6 +598,12 @@ function inspectWindowsArtifacts(rootDir: string, report: PackageSmokeReport) {
       releaseMode,
     )
     addPresenceCheck(report, rootDir, 'Windows node-pty package.json', join(nodePtyDir, 'package.json'))
+    addPresenceCheck(
+      report,
+      rootDir,
+      'Windows unpacked cc-haha-builtin plugin seed',
+      join(unpackedResourcesDir, 'plugin-seed', 'marketplaces', 'cc-haha-builtin', '.claude-plugin', 'marketplace.json'),
+    )
     addMatchCheck(
       report,
       rootDir,
@@ -680,6 +692,12 @@ function inspectLinuxArtifacts(rootDir: string, report: PackageSmokeReport) {
       releaseMode,
     )
     addPresenceCheck(report, rootDir, 'Linux node-pty package.json', join(nodePtyDir, 'package.json'))
+    addPresenceCheck(
+      report,
+      rootDir,
+      'Linux unpacked cc-haha-builtin plugin seed',
+      join(unpackedResourcesDir, 'plugin-seed', 'marketplaces', 'cc-haha-builtin', '.claude-plugin', 'marketplace.json'),
+    )
     addMatchCheck(
       report,
       rootDir,