feat: add Gemini CI analysis, PR comments, and CI orchestrator (Phase 3)

Completes the CI pipeline for automated visual regression on PRs:

- analyze-gemini.ts: Batch multimodal analysis using Google GenAI SDK,
  processes 20-30 screenshot pairs per API call with structured JSON output
- comment.ts: Generates markdown PR comments with regression tables,
  collapsible sections for intentional changes and noise, and
  pre-filter breakdowns. Posts via gh CLI.
- ci.ts: Single entrypoint orchestrating capture → prefilter → Gemini
  analysis → PR comment. Exits code 1 on high-severity regressions.

All three phases of the PRD are now implemented:
  Phase 1: Capture engine + baselines + plugin skeleton
  Phase 2: pixelmatch pre-filter with tiered classification
  Phase 3: Gemini CI + PR comments + orchestrator

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "dojowatch",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "description": "AI-native visual regression testing — capture, diff, and analyze UI changes with LLM vision",
   "author": {
     "name": "Dojo Coding LLC",

CHANGELOG.md

@@ -1,6 +1,20 @@
 # Changelog
 
-## [0.2.0] — Unreleased
+## [0.3.0] — Unreleased
+
+### Added
+- **Gemini analysis module** (`scripts/analyze-gemini.ts`): Batch multimodal analysis using Google GenAI SDK
+  - Batches 20-30 pairs per API call for efficient token usage
+  - Structured JSON output via `responseMimeType: "application/json"`
+  - Configurable model and API key environment variable
+- **PR comment generator** (`scripts/comment.ts`): Markdown summary with regression table, collapsible sections for intentional changes and noise, pre-filter breakdown
+- **CI orchestrator** (`scripts/ci.ts`): Single entrypoint for GitHub Actions
+  - Pipeline: capture → prefilter → Gemini analysis → PR comment
+  - Exits with code 1 on high-severity regressions
+  - Saves full check run to `.dojowatch/last-check.json`
+- Comment generation tests
+
+## [0.2.0]
 
 ### Added
 - **Pre-filter engine** (`scripts/prefilter.ts`): pixelmatch-based tiered classification