docs: close out Milestone 9 and document Windows/macOS packaging

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -13,8 +13,8 @@ Supported target platforms:
 
 OrbitHub is in active development.
 
-- Milestones completed: M0-M5, M7, and M8
-- Current milestone: Milestone 9 (Packaging and Distribution)
+- Milestones completed: M0-M5, and M7-M9
+- Current milestone: Milestone 10 (v1.0 Stabilization)
 - Deferred milestone: Milestone 6 (VNC Fully Working)
 - Latest checkpoint tag: `v0-m8-done`
 - VNC implementation milestone (M6) is currently deferred
@@ -90,18 +90,35 @@ cmake --build build
 ./build/orbithub
 ```
 
-## Packaging (Linux)
+## Packaging
+
+Detailed packaging instructions for all platforms:
+- [docs/BUILDING.md](docs/BUILDING.md)
+
+Linux (`.deb`):
 
 ```bash
 ./packaging/linux/build-deb.sh
 ```
 
-Optional Flatpak bundle:
+Linux (Flatpak):
 
 ```bash
 ./packaging/flatpak/build-flatpak.sh
 ```
 
+Windows (Inno Setup installer):
+
+```powershell
+.\packaging\windows\build-installer.ps1
+```
+
+macOS (`.dmg`):
+
+```bash
+./packaging/macos/build-dmg.sh
+```
+
 ## Dependencies
 
 Core dependencies:

docs/BUILDING.md

@@ -106,3 +106,37 @@ sudo apt-get install -y flatpak flatpak-builder
 
 Output path:
 - `dist/flatpak/org.darksingularity.OrbitHub.flatpak`
+
+## Windows Packaging
+
+Requires [Inno Setup 6](https://jrsoftware.org/isinfo.php) (`winget install -e --id JRSoftware.InnoSetup`).
+
+From a configured and built `build\` directory (see Windows build steps above):
+
+```powershell
+.\packaging\windows\build-installer.ps1
+```
+
+Output path:
+- `dist\windows\OrbitHub-Setup-<version>.exe`
+
+## macOS Packaging
+
+Requires `qt@6` from Homebrew (for `macdeployqt`). For a custom volume icon on
+the `.dmg`, also install `SetFile` (via Xcode's "Additional Tools", from
+[developer.apple.com/download/all](https://developer.apple.com/download/all))
+or `brew install fileicon` — packaging still works without either, just with
+the generic disk image icon.
+
+```bash
+./packaging/macos/build-dmg.sh
+```
+
+This runs `cmake --install`, then `macdeployqt` to bundle Qt frameworks and
+plugins into the `.app`, then re-signs the bundle (ad hoc, since there is no
+Developer ID certificate) so it passes macOS's launch-time code-integrity
+check. The result is unsigned/unnotarized, so first launch requires
+right-click → **Open** to bypass Gatekeeper's unidentified-developer warning.
+
+Output path:
+- `dist/macos/OrbitHub-<version>.dmg`

docs/PROGRESS.md

@@ -177,12 +177,26 @@ Git:
 
 ## Milestone 9 - Packaging and Distribution
 
-Status: Planned
+Status: Completed
 
-Planned Scope:
-- Build distributable artifacts for Windows/Linux/macOS
-- Document runtime dependencies and install prerequisites
-- Add reproducible release packaging steps/scripts
+Delivered:
+- Linux `.deb` (`packaging/linux/build-deb.sh`) and Flatpak (`packaging/flatpak/build-flatpak.sh`) packages, both verified installed and launched with working SSH/RDP
+- Renamed the app's reverse-DNS identity from `io.orbithub.OrbitHub` to `org.darksingularity.OrbitHub` (desktop file, AppStream metainfo, Flatpak manifest, macOS bundle identifier) to reflect a domain actually owned by the project
+- Fixed Linux taskbar/panel pin matching (`StartupWMClass`) so a pinned launcher merges with its running window instead of creating a duplicate entry
+- Replaced the stale, mismatched hand-authored launcher SVG with PNG icons rendered directly from the app's own `createOrbitHubAppIcon()` at each hicolor theme size
+- Windows installer via Inno Setup (`packaging/windows/orbithub.iss`, `packaging/windows/build-installer.ps1`), verified installed silently and launched cleanly with no crash events
+- macOS `.dmg` via `cmake --install` + `macdeployqt` + `hdiutil` (`packaging/macos/build-dmg.sh`), verified installed and launched after fixing:
+  - a launch crash caused by `macdeployqt` invalidating the code signature (fixed with ad hoc re-signing)
+  - a missing-library crash caused by the Linux-only `$ORIGIN` rpath token and vendored dylibs installing outside the `.app` bundle (fixed with `APPLE`-specific `@executable_path`/`Contents/Frameworks` layout)
+  - the dmg showing the generic disk icon instead of the app icon
+- README and `docs/BUILDING.md` Packaging sections documented for all three platforms
+
+Validation:
+- All three installers built, installed, and launched successfully with working SSH/RDP sessions
+- Code signing is ad hoc only (no purchased Apple Developer ID or Windows code-signing certificate), so macOS Gatekeeper and Windows SmartScreen still show first-run warnings by design
+
+Git:
+- Tag: Pending user approval
 
 ## Milestone 10 - v1.0 Stabilization