feat: v1.2.0-rc.1 - IndieWeb Features Release Candidate

Complete implementation of v1.2.0 "IndieWeb Features" release.

## Phase 1: Custom Slugs
- Optional custom slug field in note creation form
- Auto-sanitization (lowercase, hyphens only)
- Uniqueness validation with auto-numbering
- Read-only after creation to preserve permalinks
- Matches Micropub mp-slug behavior

## Phase 2: Author Discovery + Microformats2
- Automatic h-card discovery from IndieAuth identity URL
- 24-hour caching with graceful fallback
- Never blocks login (per ADR-061)
- Complete h-entry, h-card, h-feed markup
- All required Microformats2 properties
- rel-me links for identity verification
- Passes IndieWeb validation

## Phase 3: Media Upload
- Upload up to 4 images per note (JPEG, PNG, GIF, WebP)
- Automatic optimization with Pillow
  - Auto-resize to 2048px
  - EXIF orientation correction
  - 95% quality compression
- Social media-style layout (media top, text below)
- Optional captions for accessibility
- Integration with all feed formats (RSS, ATOM, JSON Feed)
- Date-organized storage with UUID filenames
- Immutable caching (1 year)

## Database Changes
- migrations/006_add_author_profile.sql - Author discovery cache
- migrations/007_add_media_support.sql - Media storage

## New Modules
- starpunk/author_discovery.py - h-card discovery and caching
- starpunk/media.py - Image upload, validation, optimization

## Documentation
- 4 new ADRs (056, 057, 058, 061)
- Complete design specifications
- Developer Q&A with 40+ questions answered
- 3 implementation reports
- 3 architect reviews (all approved)

## Testing
- 56 new tests for v1.2.0 features
- 842 total tests in suite
- All v1.2.0 feature tests passing

## Dependencies
- Added: mf2py (Microformats2 parser)
- Added: Pillow (image processing)

Version: 1.2.0-rc.1

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

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

starpunk/feeds/json_feed.py

@@ -260,14 +260,47 @@ def _build_item_object(site_url: str, note: Note) -> Dict[str, Any]:
     item["title"] = note.title
 
     # Add content (HTML or text)
+    # Per Q24: Include media as HTML in content_html
     if note.html:
-        item["content_html"] = note.html
+        content_html = ""
+
+        # Add media at top if present (v1.2.0 Phase 3)
+        if hasattr(note, 'media') and note.media:
+            content_html += '<div class="media">'
+            for media_item in note.media:
+                media_url = f"{site_url}/media/{media_item['path']}"
+                caption = media_item.get('caption', '')
+                content_html += f'<img src="{media_url}" alt="{caption}" />'
+            content_html += '</div>'
+
+        # Add text content below media
+        content_html += note.html
+        item["content_html"] = content_html
     else:
         item["content_text"] = note.content
 
     # Add publication date (RFC 3339 format)
     item["date_published"] = _format_rfc3339_date(note.created_at)
 
+    # Add attachments array (v1.2.0 Phase 3, per Q24 and ADR-057)
+    # JSON Feed 1.1 native support for attachments
+    if hasattr(note, 'media') and note.media:
+        attachments = []
+        for media_item in note.media:
+            media_url = f"{site_url}/media/{media_item['path']}"
+            attachment = {
+                'url': media_url,
+                'mime_type': media_item.get('mime_type', 'image/jpeg'),
+                'size_in_bytes': media_item.get('size', 0)
+            }
+            # Add title (caption) if present
+            if media_item.get('caption'):
+                attachment['title'] = media_item['caption']
+
+            attachments.append(attachment)
+
+        item["attachments"] = attachments
+
     # Add custom StarPunk extensions
     item["_starpunk"] = {
         "permalink_path": note.permalink,