Add migration docs and fix notarization scripts to use inline credentials

Keychain profile approach doesn't work from Galaxy terminal (no interactive
auth entitlement). Switched to inline Apple ID/team/password in notarize.sh
and package.sh. Added migration-docs/ for session continuity on new machines.

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

migration-docs/README.md

@@ -0,0 +1,21 @@
+# Migration Docs — Galaxy Project
+
+This folder contains everything needed for a new Claude instance to pick up exactly where the previous session left off.
+
+## How to Use
+
+Give all files in this folder to the new Claude instance at the start of conversation. Say something like:
+
+> "Read all files in `migration-docs/` — this is a handoff from a previous Claude session. Pick up where it left off."
+
+## Contents
+
+| File | Purpose |
+|------|---------|
+| `README.md` | This file — instructions for handoff |
+| `conversation-transcript.md` | Full transcript of the 2026-07-08/09 session |
+| `session-history-may.md` | Prior session log (May 13-14, 2026) — signing pipeline creation |
+| `project-architecture.md` | Codebase architecture reference (56-crate Rust workspace) |
+| `current-state.md` | Exact state of repo, uncommitted changes, pending work |
+| `credentials-and-signing.md` | Apple signing credentials, certificate info, how the build pipeline works |
+| `user-preferences.md` | How George works, what he expects, communication style |