Release v0.16.0 — the InterBrain Desktop App + full Windows support

Drops the -rc suffix. rc.23 was the final validated candidate; this is
the release. Ships the GitHub-as-transport pivot (the Great
Simplification), the Tauri desktop companion app + daemon + dashboard,
the gh-CLI first-run flow, and full Mac/Windows cross-platform parity —
all validated end-to-end on real hardware with real GitHub accounts.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ProjectLiminality

desktop/src-tauri/Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "interbrain-desktop"
-version = "0.16.0-rc.23"
+version = "0.16.0"
 description = "InterBrain — knowledge gardening companion"
 authors = ["Project Liminality"]
 license = "AGPL-3.0"

desktop/src-tauri/Cargo.toml

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "InterBrain",
-  "version": "0.16.0-rc.23",
+  "version": "0.16.0",
   "identifier": "org.projectliminality.interbrain",
   "build": {
     "beforeDevCommand": "npm run dev",