Version bump for the v3.0.0 release. Full release notes will be attached to the tag once this lands (draft release already prepared).

Why a major version

• Highcharts Python → JavaScript was a clean break (feat(highcharts): migrate Highcharts from Python to JavaScript (Phase 2) #8516): all 322 legacy highcharts.py implementations were removed and replaced by native highcharts.js 12.6.0.
• The catalog scope changed fundamentally: 2 → 4 languages, 10 → 15 libraries.
• The Imprint palette replaced Okabe-Ito in every implementation — a complete visual identity change.

Highlights since v2.4.0

• Julia / Makie.jl added as the 3rd language (feat(makie): add Julia + Makie.jl as the third language (Phase 5) #7613) — 74 implementations.
• JavaScript added as the 4th language with Chart.js, D3.js, Apache ECharts and a Node 22 + Playwright browser render harness emitting PNG + interactive HTML (feat(javascript): add JS runtime + render harness + Chart.js, D3.js, ECharts (Phase 1) #8244, feat(impl-generate): enable interactive HTML previews for JavaScript libs #8251).
• MUI X Charts as the first React/TSX library (feat(muix): add MUI X Charts (community, React/TSX) as a JavaScript entry #8517).
• Highcharts migrated to native JavaScript (clean break, feat(highcharts): migrate Highcharts from Python to JavaScript (Phase 2) #8516).
• Imprint palette: 8 colorblind-safe hues + 3 semantic anchors; ~1,300 implementations migrated in one wave (feat(palette): adopt imprint — new categorical palette + named API + frontend rebuild #7692, chore(palette): migrate matplotlib impls from Okabe-Ito to imprint #7776–chore(palette): migrate R + Julia impls from Okabe-Ito to imprint #7798); /palette page rebuilt with OKLCH wheel + ΔE matrices (feat(palette): redesign /palette — smooth wheel, chroma, IMPRINT object, ΔE matrix #8125).
• Frontend modernization: 11-PR restructure of app/ + CI lint/format/type-check gates + ARCHITECTURE.md (chore(app): frontend tooling baseline — Prettier, import sorting, CI lint/type-check gates #8519–docs(app): add frontend ARCHITECTURE.md and refresh project-guide section #8596).
• Render quality: canvas halved to 3200×1800 / 2400×2400 (feat(style): canvas 3200x1800 + proportional review rules #7387), hard canvas-size gate (feat(regen): hard canvas-size gate with delta-aware repair messages #7517), AR-09 edge-clipping auto-reject (fix(altair,review): PAD-only normalization + AR-09 edge-clipping auto-reject #7528).
• Pipeline: watchdog rescues 3 more stuck-PR failure modes (feat(watchdog): cover ai-approved / ai-rejected / no-label stuck PRs #7687), daily-regen 10×/day on Sonnet (chore(daily-regen): halve cadence to 10× daily #7717, chore(daily-regen): switch default model from haiku to sonnet #7286), alembic dual-head fix for Postgres sync (fix(db): merge feedback + language alembic heads #7285).
• 885 regenerations + 310 new implementations; 21 dependency updates.

Known follow-up (not in this PR): highcharts-core is still listed in pyproject.toml although the Python wrapper is no longer used (deferred in #8516).

Full Changelog: v2.4.0...main

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