docs: Add Phase 4 implementation report

Document completed Phase 4 implementation with test results, verification output, and backwards compatibility notes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
2025-12-16 08:01:06 -07:00
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+# v1.4.0 Phase 4 Implementation Report
+
+**Date**: 2025-12-16
+**Phase**: Phase 4 - Enhanced Feed Media
+**Status**: ✅ Complete
+**Developer**: Claude Code Agent
+
+---
+
+## Implementation Summary
+
+Phase 4 enhances all three feed formats (RSS, JSON Feed, ATOM) to expose media variants and metadata to feed readers.
+
+### Changes Made
+
+#### 1. RSS Feed (`starpunk/feeds/rss.py`)
+
+**Enhanced streaming RSS generation** with full Media RSS specification support:
+
+- Wrap size variants in `<media:group>` elements
+- Add `<media:content>` for large/medium/small variants with attributes:
+  - `url`: Variant image URL
+  - `type`: MIME type
+  - `medium`: "image"
+  - `isDefault`: "true" for largest available variant
+  - `width`: Image width in pixels
+  - `height`: Image height in pixels
+  - `fileSize`: File size in bytes
+- Add `<media:thumbnail>` for thumb variant with dimensions
+- Add `<media:title type="plain">` for captions
+- Implement isDefault fallback logic: large → medium → small
+- Maintain backwards compatibility for media without variants (legacy fallback)
+
+**Example output** (with variants):
+```xml
+<media:group>
+  <media:content url="https://example.com/media/2025/12/uuid_medium.jpg"
+                 type="image/jpeg"
+                 medium="image"
+                 isDefault="true"
+                 width="640"
+                 height="480"
+                 fileSize="2088"/>
+  <media:content url="https://example.com/media/2025/12/uuid_small.jpg"
+                 type="image/jpeg"
+                 medium="image"
+                 isDefault="false"
+                 width="320"
+                 height="240"
+                 fileSize="738"/>
+</media:group>
+<media:thumbnail url="https://example.com/media/2025/12/uuid_thumb.jpg"
+                 width="150"
+                 height="150"/>
+<media:title type="plain">Caption text</media:title>
+```
+
+#### 2. JSON Feed (`starpunk/feeds/json_feed.py`)
+
+**Enhanced `_starpunk` extension** with media variant information:
+
+- Add `about` URL (configurable via `STARPUNK_ABOUT_URL` config)
+  - Default: `https://github.com/yourusername/starpunk`
+- Add `media_variants` array when variants exist
+- Each variant entry includes:
+  - `url`: Variant image URL
+  - `width`: Image width
+  - `height`: Image height
+  - `size_in_bytes`: File size
+  - `mime_type`: MIME type
+
+**Example output**:
+```json
+{
+  "_starpunk": {
+    "permalink_path": "/note/test",
+    "word_count": 42,
+    "about": "https://github.com/yourusername/starpunk",
+    "media_variants": [
+      {
+        "caption": "Test caption",
+        "variants": {
+          "thumb": {
+            "url": "https://example.com/media/2025/12/uuid_thumb.jpg",
+            "width": 150,
+            "height": 150,
+            "size_in_bytes": 3000
+          },
+          "small": { ... },
+          "medium": { ... },
+          "original": { ... }
+        }
+      }
+    ]
+  }
+}
+```
+
+#### 3. ATOM Feed (`starpunk/feeds/atom.py`)
+
+**Enhanced enclosure links** with caption support:
+
+- Add `title` attribute to enclosure links for captions
+- Keep simple (no variants in ATOM per design decision)
+
+**Example output**:
+```xml
+<link rel="enclosure"
+      type="image/jpeg"
+      href="https://example.com/media/2025/12/uuid.jpg"
+      length="3138"
+      title="Caption text"/>
+```
+
+#### 4. Test Updates (`tests/test_feeds_rss.py`)
+
+**Updated streaming media test** to match v1.4.0 behavior:
+
+- Changed `item.find("media:content")` to `item.find(".//media:content")`
+- Now searches descendants (inside `media:group`) instead of direct children
+- Updated docstring to reflect v1.4.0 variant support
+
+---
+
+## Testing
+
+### Test Results
+
+All 44 feed tests pass:
+```
+tests/test_feeds_rss.py ............. (13 tests)
+tests/test_feeds_json.py ............ (13 tests)
+tests/test_feeds_atom.py ............ (11 tests)
+tests/test_feeds_rss.py ......... (7 integration tests)
+```
+
+### Manual Verification
+
+Verified Phase 4 features with live test:
+
+1. **RSS Feed**: ✅
+   - Has `media:group` wrapper
+   - Has 2 `media:content` elements (medium, small)
+   - All attributes present (url, type, medium, isDefault, width, height, fileSize)
+   - Has `media:thumbnail` with width/height
+   - Has `media:title` with type="plain"
+
+2. **JSON Feed**: ✅
+   - Has `_starpunk` extension
+   - Has `about` URL
+   - Has `media_variants` array
+   - All variant types present (thumb, small, medium, original)
+   - All fields present (url, width, height, size_in_bytes)
+
+3. **ATOM Feed**: ✅
+   - Enclosures have `title` attribute
+   - Caption text preserved
+
+---
+
+## Backwards Compatibility
+
+Phase 4 maintains full backwards compatibility:
+
+1. **Media without variants** (pre-v1.4.0 uploads):
+   - RSS generates legacy `<media:content>` directly under `<item>`
+   - JSON Feed omits `media_variants` key
+   - ATOM behaves as before
+
+2. **Feed readers**:
+   - Readers that don't understand Media RSS simply ignore the namespace
+   - Readers that don't understand `_starpunk` extension ignore it
+   - All feeds still include standard elements (enclosure, attachments)
+
+---
+
+## Configuration
+
+New configuration option added:
+
+```python
+# config.py or environment
+STARPUNK_ABOUT_URL = "https://github.com/yourusername/starpunk"
+```
+
+Default value: `https://github.com/yourusername/starpunk`
+
+This URL documents the `_starpunk` JSON Feed extension for consumers.
+
+---
+
+## Design Document Compliance
+
+✅ All Phase 4 requirements from design document implemented:
+
+- [x] RSS: Use `<media:group>` for variants
+- [x] RSS: Add `<media:content>` with all attributes
+- [x] RSS: Add `<media:thumbnail>` for thumb variant
+- [x] RSS: Add `<media:title>` for captions
+- [x] RSS: Handle isDefault correctly (largest available)
+- [x] RSS: Backwards compatibility for legacy media
+- [x] JSON Feed: Add `_starpunk.about` URL
+- [x] JSON Feed: Add `_starpunk.media_variants` array
+- [x] ATOM: Add `title` attribute to enclosures
+- [x] Ensure variants loaded in feeds (via `get_note_media()`)
+
+---
+
+## Files Modified
+
+1. `/home/phil/Projects/starpunk/starpunk/feeds/rss.py` - RSS enhancements
+2. `/home/phil/Projects/starpunk/starpunk/feeds/json_feed.py` - JSON Feed enhancements
+3. `/home/phil/Projects/starpunk/starpunk/feeds/atom.py` - ATOM enhancements
+4. `/home/phil/Projects/starpunk/tests/test_feeds_rss.py` - Test update for v1.4.0
+
+---
+
+## Next Steps
+
+Phase 4 is complete. The next phase (Phase 5) is Testing & Documentation.
+
+Per design document, Phase 5 includes:
+- Unit tests for Phase 4 features (existing tests pass)
+- Update CHANGELOG.md
+- Update architecture docs
+- Version bump to 1.4.0
+
+---
+
+## Questions for Architect
+
+None. Phase 4 implementation follows design document exactly.
+
+---
+
+## Generated with
+
+🤖 Generated with [Claude Code](https://claude.com/claude-code)
+
+Co-Authored-By: Claude <noreply@anthropic.com>