feat: add 10 new plugins

[mturac]

Adds 10 new community plugins to the appropriate sections:

Automation DevOps

• dep-drift — Detects lockfile divergence, silent transitive dep updates, and license incompatibilities
• flag-ops — Manages feature flags, finds orphaned/stale flags, tracks rollout status
• migrate-safe — Analyzes database migrations for destructive operations, generates rollback scripts

Code Quality Testing

• a11y-ci — Automated WCAG accessibility audits with line-level annotations and fix suggestions
• perf-lens — Identifies N+1 query patterns, redundant React re-renders, and bundle bloat
• test-scout — Finds untested code paths and generates targeted unit test stubs

Development Engineering

• api-contract — Validates frontend API calls match backend schemas, detects breaking changes before deploy
• i18n-sync — Keeps translation keys in sync across locales
• code-archaeologist — Uncovers intent and evolution in legacy codebases through git history and blame analysis

Documentation

• adr-sync — Keeps Architecture Decision Records aligned with actual code, detects stale ADRs

All entries follow the existing list format.