v2.0.9

chore(release): v2.0.9

Version bump from 2.0.8 → 2.0.9 plus the release-prep that goes with it.

package.json
  - version 2.0.8 → 2.0.9
  - description updated to mention 22 MCP tools (was 16; the 6 new
    are validate_diff, get_recent_decisions, get_session_context,
    did_we_discuss_this, get_intervention_history, get_change_plan)
  - new script: 'bench:scale' wires up the harness landed in the
    previous bench commit

package-lock.json
  - regenerated via 'npm install --package-lock-only'
  - reconciles two pieces of pre-existing drift: tree-sitter grammars
    moved to optionalDependencies and the engines upper bound dropped
    in earlier commits but never reflected in the lockfile until now

README.md
  - new sections: GitHub Action (PR impact reports), ANCI v0.1 spec,
    Scale benchmark numbers
  - languages table extended (R, Prisma schema, HTML)
  - CLI table adds 'carto pr-impact'
  - benchmark numbers refreshed against current corpus
  - action ref bumped: theanshsonkar/carto@v2.0.8 → @v2.0.9

.npmignore
  - excludes BENCHMARK_RESULTS.md, CARTO_SCALE_REPORT.md,
    CARTO_V2_ARCHITECTURE.md (internal docs)
  - excludes .gitattributes / .gitignore (not needed at install time)
  - excludes action.yml (repo-root artifact, not part of the npm pkg)