Add repo picker, update checker, and distribution tooling1.0.00.7.00.6.0

Closes #11-#15 (milestones 0.6.0, 0.7.0, 1.0.0).

- Repo picker: on-demand broader OAuth scope (security_events repo),
  requested only when the "Browse your repos" action is used, never by
  default. Lists /user/repos via the existing pagination helper. Granted
  scope persisted with backward-compatible decoding for existing state
  files. Fixed a bug where a failed re-auth force-signed-out a user who
  already had a valid narrower-scope token.
- Update checker: polls this repo's GitHub Releases API, surfaces a
  banner linking to new releases. Skipped on the Mac App Store build via
  a runtime receipt check rather than a separate build configuration.
- Fixed MARKETING_VERSION, stuck at Xcode's default "1.0" this whole
  time unrelated to our git tags — now 1.0.0, matching this release.
- Added PrivacyInfo.xcprivacy (no tracking, no collected data).
- Added scripts/build-dmg.sh (archive, Developer ID export, notarize,
  staple) and Casks/octosentry.rb (Homebrew Cask template), plus
  DISTRIBUTION.md documenting both channels end to end.

Entitlements were already identical across all builds — no divergence
needed there. What remains for actual App Store submission and notarized
DMG builds is account-specific (Apple Developer Program membership,
certificates, App Store Connect submission) and can't be done from here;
documented clearly in DISTRIBUTION.md.

1 files changed, 3 insertions, 2 deletions

diff --git a/octosentry/octosentryApp.swift b/octosentry/octosentryApp.swift
index e80c4a0..d9f388e 100644
--- a/octosentry/octosentryApp.swift
+++ b/octosentry/octosentryApp.swift
@@ -15,10 +15,11 @@ enum SecurityEventWindow {
 struct octosentryApp: App {
     @State private var store = SecurityEventStore()
     @State private var authStore = AuthStore()
+    @State private var updateStore = UpdateStore()
 
     var body: some Scene {
         MenuBarExtra {
-            SecurityEventListView(store: store, authStore: authStore)
+            SecurityEventListView(store: store, authStore: authStore, updateStore: updateStore)
                 .frame(width: 380, height: 420)
         } label: {
             MenuBarIconView(criticalCount: store.unseenCriticalCount)
@@ -26,7 +27,7 @@ struct octosentryApp: App {
         .menuBarExtraStyle(.window)
 
         Window("Security Events", id: SecurityEventWindow.id) {
-            SecurityEventListView(store: store, authStore: authStore, isStandaloneWindow: true)
+            SecurityEventListView(store: store, authStore: authStore, updateStore: updateStore, isStandaloneWindow: true)
                 .frame(minWidth: 420, minHeight: 480)
         }
     }