chore: add RPM/DEB packaging artifacts — 5.10

3 packages: python3-meshbay-common (dep), meshbay-hub, meshbay-node.
RPM: spec files with pre/post scriptlets (useradd, systemd macros).
DEB: DEBIAN/control + postinst for hub, control for node + common.
Systemd: hub.service (system, security hardening) + node.service
(user template @%i, EnvironmentFile for MESHBAY_UNLOCK_KEY).
packaging/README.md: build + install instructions.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

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diff --git a/packaging/README.md b/packaging/README.md
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+# MeshBay — Packaging
+
+Three distributable packages:
+
+| Package | RPM spec | DEB control | Description |
+|---|---|---|---|
+| `python3-meshbay-common` | `rpm/python3-meshbay-common.spec` | `deb/python3-meshbay-common/` | Shared crypto + protocol lib |
+| `meshbay-hub` | `rpm/meshbay-hub.spec` | `deb/meshbay-hub/` | Hub server (FastAPI + PostgreSQL) |
+| `meshbay-node` | `rpm/meshbay-node.spec` | `deb/meshbay-node/` | Node daemon + local UI |
+
+## Building RPMs (Fedora/RHEL)
+
+```bash
+# Install build tools
+sudo dnf install -y rpm-build python3-pip
+
+# Build all three packages
+for pkg in python3-meshbay-common meshbay-hub meshbay-node; do
+    rpmbuild -ba packaging/rpm/${pkg}.spec
+done
+```
+
+## Building DEBs (Debian/Ubuntu)
+
+```bash
+# Install build tools
+sudo apt install -y dpkg-dev debhelper python3-pip
+
+# Build common library first (dependency)
+dpkg-deb --build packaging/deb/python3-meshbay-common
+dpkg-deb --build packaging/deb/meshbay-hub
+dpkg-deb --build packaging/deb/meshbay-node
+
+# Install
+sudo dpkg -i python3-meshbay-common_0.1.0_all.deb
+sudo dpkg -i meshbay-hub_0.1.0_all.deb
+sudo dpkg -i meshbay-node_0.1.0_all.deb
+```
+
+## Install order
+
+Always install `python3-meshbay-common` first (dependency of both hub and node).
+
+## Post-install (hub)
+
+```bash
+# Generate hub keypair
+sudo -u meshbay meshbay-hub --generate-keys
+
+# Edit config
+sudo nano /etc/meshbay/hub.toml
+
+# Configure Caddy for HTTPS
+sudo nano /etc/caddy/Caddyfile
+
+# Start
+sudo systemctl enable --now meshbay-hub
+```
+
+## Post-install (node)
+
+```bash
+# Initialize node (writes example config)
+meshbay-node init
+
+# Edit config
+nano ~/.config/meshbay/node.toml
+
+# Start as user service
+systemctl --user enable --now meshbay-node
+```
+
+## Systemd service files
+
+| File | Location |
+|---|---|
+| `systemd/meshbay-hub.service` | `/usr/lib/systemd/system/meshbay-hub.service` |
+| `systemd/meshbay-node.service` | `/usr/lib/systemd/user/meshbay-node.service` |
+
+The node service is a **user service** (runs as the user's own account, with access to their home directory). The hub is a **system service** (runs as the `meshbay` system account).