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>

migrations/006_add_author_profile.sql

@@ -0,0 +1,27 @@
+-- Migration 006: Add author profile discovery table
+--
+-- Per ADR-061 and v1.2.0 Phase 2:
+-- Stores author information discovered from IndieAuth profile URLs
+-- Enables automatic h-card population for Microformats2 compliance
+--
+-- Features:
+-- - Caches author h-card data from IndieAuth 'me' URL
+-- - 24-hour TTL for cache freshness (per developer Q&A Q14)
+-- - Graceful fallback when discovery fails
+-- - Supports rel-me links for identity verification
+
+-- Create author profile table
+CREATE TABLE IF NOT EXISTS author_profile (
+    me TEXT PRIMARY KEY,           -- IndieAuth 'me' URL (user identity)
+    name TEXT,                      -- h-card p-name
+    photo TEXT,                     -- h-card u-photo URL
+    url TEXT,                       -- h-card u-url (canonical)
+    note TEXT,                      -- h-card p-note (bio)
+    rel_me_links TEXT,              -- JSON array of rel-me URLs
+    discovered_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    cached_until DATETIME NOT NULL  -- 24-hour cache per Q&A Q14
+);
+
+-- Index for cache expiry checks
+CREATE INDEX IF NOT EXISTS idx_author_profile_cache
+ON author_profile(cached_until);

migrations/007_add_media_support.sql

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+-- Migration 007: Add media upload support
+-- Per ADR-057: Social media attachment model
+-- Per ADR-058: Image optimization strategy
+-- Version: 1.2.0 Phase 3
+
+-- Media storage table
+-- Stores metadata for uploaded media files
+CREATE TABLE IF NOT EXISTS media (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    filename TEXT NOT NULL,              -- Original filename from upload
+    stored_filename TEXT NOT NULL,       -- UUID-based filename on disk
+    path TEXT NOT NULL UNIQUE,           -- Full path: media/YYYY/MM/uuid.ext
+    mime_type TEXT NOT NULL,             -- image/jpeg, image/png, etc.
+    size INTEGER NOT NULL,               -- File size in bytes
+    width INTEGER,                       -- Image width (pixels)
+    height INTEGER,                      -- Image height (pixels)
+    uploaded_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Note-media junction table
+-- Per Q4: Upload after note creation, associate via note_id
+-- Per Q7: Caption support for accessibility
+CREATE TABLE IF NOT EXISTS note_media (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    note_id INTEGER NOT NULL,
+    media_id INTEGER NOT NULL,
+    display_order INTEGER NOT NULL DEFAULT 0,  -- Order for display (0-3)
+    caption TEXT,                              -- Alt text / accessibility
+    FOREIGN KEY (note_id) REFERENCES notes(id) ON DELETE CASCADE,
+    FOREIGN KEY (media_id) REFERENCES media(id) ON DELETE CASCADE,
+    UNIQUE(note_id, media_id)
+);
+
+-- Indexes for performance
+CREATE INDEX IF NOT EXISTS idx_media_uploaded ON media(uploaded_at);
+CREATE INDEX IF NOT EXISTS idx_note_media_note ON note_media(note_id);
+CREATE INDEX IF NOT EXISTS idx_note_media_order ON note_media(note_id, display_order);