feat: PR Review Auto-Fix — auto-respond to reviewer comments and CI failures

[crshdn]

Feature 1: PR Review Auto-Fix

When reviewers leave comments or CI fails on Autensa-generated PRs, the system automatically re-dispatches to the original agent with fix context. Max 3 cycles, then escalates to human.

New Files (1)

• src/lib/pr-review-handler.ts — collect comments, format agent message, manage cycles, trigger re-dispatch

Modified Files (8)

• src/lib/types.ts — review_fix status, review_fix_count/max on Task, auto_fix_pr_reviews on Product
• src/lib/db/schema.ts — review_fix in status CHECK, new columns
• src/lib/db/migrations.ts — migration 029: three new columns
• src/app/api/webhooks/github/route.ts — pull_request_review, issue_comment, CI failure handlers
• src/app/api/tasks/[id]/dispatch/route.ts — accepts review_fix_message for context injection
• src/components/TaskModal.tsx — review-fix cycle counter in PR section
• src/components/MissionQueue.tsx — 'Fixing PR' kanban column with animated badge
• src/app/api/workspaces/route.ts — review_fix in workspace stats

TypeScript compiles clean