Feat v0.3.8 distribution (#21)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

CHANGELOG.md

@@ -2,6 +2,39 @@
 
 All notable changes to Switchboard Core are documented here.
 
+## v0.3.8 — Distribution
+
+### Added
+
+- **Bundled packages**: Production Docker image now ships with 12 pre-built
+  `.pkg` archives (4 workflows, 3 surfaces, 1 full, 1 library, 2 test runners,
+  1 extension). Auto-installed on first boot via `InstallBundledPackages()`.
+  Install-once, skip-if-present — admin uninstalls are respected on restart.
+- **Package allowlist** (`BUNDLED_PACKAGES`): Comma-separated list of package
+  IDs to install. Empty (default) installs all. Useful for Helm/K8s where
+  different environments need different packages.
+- **Skip bundled** (`SKIP_BUNDLED_PACKAGES=true`): Disables auto-install
+  entirely. Intended for production until post-MVP packages are ready.
+- **Builder image** (`Dockerfile.builder`): Pre-caches Go modules, Node
+  dependencies, and vendor lib tarballs for faster custom builds.
+- **Distribution docs** (`docs/DISTRIBUTION.md`): Quick start, bundled
+  packages, builder image usage, custom build guide, production deployment
+  reference.
+- **Migration 012**: Adds `bundled` to `packages.source` CHECK constraint
+  (both Postgres and SQLite).
+- **K8s manifest**: `SKIP_BUNDLED_PACKAGES` and `BUNDLED_PACKAGES` env vars
+  added to `k8s/switchboard.yaml`.
+- **Tests**: 6 handler tests (fresh install, skip existing, missing dir, empty
+  dir, dormant handling, allowlist filtering).
+
+### Environment defaults
+
+| Environment | `SKIP_BUNDLED_PACKAGES` | `BUNDLED_PACKAGES` |
+|-------------|------------------------|--------------------|
+| Dev (compose) | `false` | (empty = all) |
+| Test (K8s) | `false` | (empty = all) |
+| Prod (K8s) | `true` | — |
+
 ## v0.3.7 — Package Audit
 
 ### Added