Update docs, changelog, examples, and add ADRs for v1.2

- Add v1.1.0 and v1.2.0 changelog entries
- Add exclude field to config reference and example config
- Add ADRs documenting all major design decisions
- Fix step numbering in reverse_sync()
- Fix action.yml to copy VERSION file
- Add dist/ and .env to .gitignore
- Use refs/tags/ format for Nix flake tag refs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

examples/reverse.yml

@@ -10,7 +10,7 @@ name: "Josh Sync ← Subrepo"
 
 on:
   schedule:
-    - cron: "0 1,7,13,19 * * *"    # Every 6h, offset from forward
+    - cron: "0 1,7,13,19 * * *" # Every 6h, offset from forward
   workflow_dispatch:
     inputs:
       target:
@@ -40,7 +40,7 @@ jobs:
           curl -sL "https://github.com/mikefarah/yq/releases/download/v4.44.6/yq_linux_amd64" \
             -o /usr/local/bin/yq && chmod +x /usr/local/bin/yq
 
-      - uses: https://your-gitea.example.com/org/josh-sync@v1
+      - uses: https://your-gitea.example.com/org/josh-sync@v1.2
         with:
           direction: reverse
           target: ${{ github.event.inputs.target || '' }}