feat(makie): add Julia + Makie.jl as the third language (Phase 5)

[MarkusNeusinger]

Closes #7612.

Adds Julia as anyplot's third language with Makie.jl (CairoMakie backend) as its first library entry. Generalizes the multi-language plumbing introduced for R/ggplot2 in #6944 + follow-ups (#6947, #6961, #7066) so every python | r dispatch now handles python | r | julia uniformly.

Phase ordering — heads-up

This ships Phase 5 (Julia) before Phases 1+2 (JavaScript family), which the issue called out explicitly. The multi-language pipeline is already proven on R; shipping Julia next provides a cheap second non-Python validation that surfaces multi-language gaps the JS work would otherwise hit cold. The JavaScript phases remain planned in unchanged order. See docs/concepts/library-expansion.md §9.

Why Makie over Plots.jl

Distinct scientific stack (not a wrapper), ~45 % share within Julia, MIT-licensed. CairoMakie is the right backend for CI — pure-Cairo, headless, no GPU / GLFW window. PlotlyJS.jl is a plotly.js wrapper (already covered via Python Plotly). Plots.jl is the alternative; revisit only if Plausible data flips. GLMakie / WGLMakie interactive backends are out of scope; INTERACTIVE_LIBRARIES intentionally excludes Makie.

What's in the PR

Constants + registry

• core/constants.py: add julia language, makie library
• tests/unit/core/test_constants.py: assert julia + makie

CI runtime

• .github/actions/setup-julia/action.yml: install Julia 1.11, restore from Project.toml / Manifest.toml, smoke-test a CairoMakie render
• Project.toml: pin CairoMakie + Makie + dataset packages (CSV, Colors, ColorSchemes, DataFrames, PalmerPenguins, RDatasets, Random, Statistics)

Manifest.toml is intentionally not committed — it gets resolved by the first CI run; the action falls back to Pkg.add(...) when Manifest.toml is absent so first-run doesn't hard-fail. (Same model as renv.lock had pre-bump on the R rollout.)

Workflows

Each workflow derives LANGUAGE + EXT from LIBRARY via a case statement. Every case now has matplotlib→python, ggplot2→r, makie→julia:

• impl-generate.yml, impl-repair.yml, impl-review.yml, impl-merge.yml: add the makie→julia arm; install setup-julia when language==julia; detect Julia version via julia -e 'print(VERSION)'; detect Makie version via Pkg.dependencies()
• impl-review.yml:
  • extend canvas-gate library-cause map with a Makie entry (Figure(resolution=(1600,900)) + px_per_unit=2 → 3200×1800; resolution=(1200,1200) → 2400×2400)
  • extend header-rewrite step to handle #-prefixed Julia comment blocks, with prepend fallback when missing (same fix as chore(ggplot2): follow-up Copilot review fixes after #6944 merge #6947 did for Python / R)
• bulk-generate.yml: add makie to library choices and ALL_LIBRARIES
• impl-merge.yml: completion total now derives from the actual library list rather than hardcoding 9

Prompts

• prompts/library/makie.md (new): no-workarounds policy, NOT_FEASIBLE for primary-interactivity specs, canvas hard rule, ANYPLOT_THEME mapping, forbidden patterns (no Plots.jl, no display(fig), no GLMakie/WGLMakie), # -comment header style
• plot-generator.md: extend lead, available environment, forbidden patterns with Julia/Makie section
• quality-evaluator.md, workflow-prompts/ai-quality-review.md: extend the AR-08 static-libraries list with makie; extend the language allow-list with julia
• workflow-prompts/impl-generate-claude.md, impl-repair-claude.md: add the julia | .jl | julia --project=. row to the (language, ext, runner) table; add Julia run + format sections
• workflow-prompts/impl-similarity-claude.md: third arm for julia in the {language} mapping

Frontend (avoids the two-follow-up-PR pattern from #6961 / #7066)

• app/src/constants/index.ts: add makie to LIBRARIES, LIB_ABBREV: 'mk', LIB_TO_LANG: 'julia', LANG_DISPLAY: 'Julia', LANG_EXT: 'jl'
• app/src/components/CodeHighlighter.tsx: register julia Prism grammar
• app/src/types/react-syntax-highlighter.d.ts: declare the prism/julia module locally — TS7016 fix in same PR, not deferred (the issue specifically called this out as a gap not to repeat)
• app/src/components/LibraryCard.tsx: description for makie
• app/src/components/PlotOfTheDay.tsx, PlotOfTheDayTerminal.tsx: julia --project=. runner token + .jl extension when language is julia
• app/src/pages/LibrariesPage.tsx, AboutPage.tsx, PlotsPage.tsx: meta-description copy bumped to "Eleven libraries across Python, R, and Julia"
• app/src/pages/DebugPage.tsx: makie column in SpecStatus interface (the grid template uses LIBRARIES.length so the matrix grows automatically)

Backend

• api/routers/debug.py: SpecStatusItem and library_names entries for makie
• api/routers/specs.py: doc comment updated to note makie is Julia

Tests

• app/src/components/CodeHighlighter.test.tsx: julia-grammar case
• app/src/hooks/useCodeFetch.test.ts: julia ?language= case + three-language cache-key test
• app/src/pages/DebugPage.test.tsx: makie field on fixture

Docs

• docs/concepts/library-expansion.md: §1 current-state table grows to 11 entries; §8 Phase 5 marked shipped; §9 records the phase-skip rationale, Makie-over-Plots.jl decision, and CairoMakie-only scope
• docs/reference/repository.md: implementations/ layout shows python/ + r/ + julia/ siblings
• docs/concepts/vision.md, docs/reference/style-guide.md: pipeline-story copy ("eleven libraries in three languages")
• docs/reference/plausible.md: language slug list now includes julia
• prompts/README.md, agentic/docs/project-guide.md: Makie added

Verified

• ✅ core/constants.py loads: len(SUPPORTED_LIBRARIES)=11, SUPPORTED_LANGUAGES={'python','r','julia'}
• ✅ pytest tests/unit/core tests/unit/api/test_routers.py tests/unit/api/test_debug.py tests/unit/api/test_schemas.py — 213 passed, no regressions
• ✅ Project.toml valid TOML, deps load
• Frontend tests are wired but I couldn't run yarn test in this environment (no node_modules). Code follows the existing patterns from the R rollout.

Post-merge follow-ups (called out in the issue)

1. Run uv run python -m automation.scripts.label_manager sync once so library:makie, generate:makie, impl:makie:{pending,done,failed} labels appear.
2. First CI run of setup-julia will resolve Manifest.toml — commit that lockfile in a tiny follow-up so subsequent runs use Pkg.instantiate() instead of the Pkg.add fallback.
3. Trigger bulk-generate.yml -f library=makie to fill the catalog (separate from this infra PR — the issue called this out as "Out of scope" / handled by the regular flow).
4. Optional julia.anyplot.ai marketing subdomain (mentioned in the issue's "Out of scope" section; small follow-up modeled on python.anyplot.ai).

---

Generated by Claude Code

[Copilot]

Pull request overview

Adds Julia as a third supported implementation language and introduces Makie.jl (via the CairoMakie backend) as the first Julia plotting library, extending the existing multi-language (Python/R) plumbing across CI workflows, prompts, backend, and frontend.

Changes:

• Extend core registries to include julia + makie, and update unit tests accordingly.
• Add CI support for Julia (composite setup action + workflow dispatch mapping + header rewrite rules).
• Wire Julia/Makie through the frontend code viewer/highlighting and related UI copy, plus targeted tests.

Reviewed changes

Copilot reviewed 36 out of 38 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
core/constants.py	Adds julia language metadata and makie library metadata/IDs.
tests/unit/core/test_constants.py	Updates constants tests for makie + julia and file extensions.
Project.toml	Introduces Julia project deps/compat for CairoMakie-based rendering.
.github/actions/setup-julia/action.yml	New composite action to install Julia + deps and smoke-test CairoMakie rendering.
.github/workflows/impl-generate.yml	Adds makie→julia dispatch, Julia setup, and Julia version/library version detection.
.github/workflows/impl-repair.yml	Adds makie→julia dispatch and Julia setup step for repair runs.
.github/workflows/impl-review.yml	Adds makie→julia dispatch, canvas-gate guidance, and Julia header rewrite support.
.github/workflows/impl-merge.yml	Adds makie→julia dispatch and updates “all libraries complete” accounting for 11 libs.
.github/workflows/bulk-generate.yml	Adds makie to library choices and ALL_LIBRARIES.
api/routers/specs.py	Updates endpoint doc comment to reflect makie as Julia.
api/routers/debug.py	Extends debug status model/maps to include makie.
app/src/constants/index.ts	Adds makie to library lists and maps it to julia + jl display extension.
app/src/components/CodeHighlighter.tsx	Registers Prism grammar for julia.
app/src/types/react-syntax-highlighter.d.ts	Adds local TS module declaration for Prism Julia grammar import.
app/src/components/CodeHighlighter.test.tsx	Adds test coverage for Julia highlighting selection.
app/src/components/LibraryCard.tsx	Adds Makie library description copy.
app/src/components/PlotOfTheDay.tsx	Extends runner/ext display and language label/version fallback for Julia.
app/src/components/PlotOfTheDayTerminal.tsx	Extends runner/ext display for Julia (julia --project=. / .jl).
app/src/hooks/useCodeFetch.test.ts	Adds tests ensuring ?language=julia URL behavior and cache key separation.
app/src/pages/DebugPage.tsx	Extends SpecStatus interface with makie column field.
app/src/pages/DebugPage.test.tsx	Updates fixture to include makie field.
app/src/pages/LibrariesPage.tsx	Updates meta-description copy for 11 libraries / 3 languages.
app/src/pages/PlotsPage.tsx	Updates meta-description copy for 11 libraries / 3 languages.
app/src/pages/AboutPage.tsx	Updates meta-description copy for 11 libraries / 3 languages.
prompts/library/makie.md	New Makie-specific generation rules (CairoMakie-only, canvas rules, theme mapping, header style).
prompts/plot-generator.md	Extends generator rules for Julia/Makie runtime, header style, and feasibility constraints.
prompts/quality-evaluator.md	Extends evaluator framing for Julia/Makie and static-library rules.
prompts/workflow-prompts/ai-quality-review.md	Extends workflow review prompt for .jl + Julia language allow-list.
prompts/workflow-prompts/impl-generate-claude.md	Adds Julia row to (language/ext/runner) table and Julia-specific run notes.
prompts/workflow-prompts/impl-repair-claude.md	Adds Julia-specific run notes and style guidance.
prompts/workflow-prompts/impl-similarity-claude.md	Extends {language}/{ext} mapping text to include Julia/Makie.
prompts/README.md	Updates library-rules count to 11.
docs/concepts/library-expansion.md	Updates current-state table and marks Phase 5 (Julia/Makie) as shipped.
docs/concepts/vision.md	Updates “current stack” narrative to 11 libraries / 3 languages.
docs/reference/repository.md	Documents implementations layout including implementations/julia/ and .jl.
docs/reference/style-guide.md	Updates narrative counts to include Julia/Makie.
docs/reference/plausible.md	Updates language slug list to include julia.
agentic/docs/project-guide.md	Updates catalog overview/docs to include Makie + PNG-only list and counts.

[codecov]

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