feat: javascript helpers extension

[alandefreitas]

Fixes #881, moves us closer on #1113.

• Swapped Duktape for JerryScript across CMake, CI, presets, bootstrap recipe, and the install
  docs; added a small port layer so it all hooks up cleanly.
• Tightened the JS helper runtime: shared context lifetime, safer value accessors, clearer errors,
  and helper registration that keeps options/hash intact for block helpers; added unit tests to cover
  the new paths.
• Added an addons-supplemental config option so you can layer extra addons/overrides; documented it and
  dropped in golden fixtures for the JS helpers. Also cleaned up the TestRunner include path.

[github-actions]

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⚠️ Warnings

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Commit 4289920 (feat: javascript helpers extension) changes 2962 source lines. Consider splitting it into smaller, reviewable chunks.

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✨ Highlights

• 🧪 Existing golden tests changed (behavior likely shifted)

🧾 Changes by Scope

Scope	Lines Δ	Lines +	Lines -	Files Δ	Files +	Files ~	Files ↔	Files -
Source	2971	1034	1937	-5	-	6	-	11
Golden Tests	496	496	-	41	22	-	19	-
Tests	452	341	111	3	1	2	-	-
Third-party	369	229	140	1	4	-	-	3
CI / Roadmap	192	151	41	9	1	8	-	-
Docs	113	34	79	3	-	3	-	-
Other	24	2	22	-	-	1	-	1
Build / Toolchain	21	7	14	2	-	2	-	-
Total	4638	2294	2344	54	28	22	19	15

Legend: Files + (added), Files ~ (modified), Files ↔ (renamed), Files - (removed)

🔝 Top Files

• src/lib/Support/JavaScript.cpp (Source): 2471 lines Δ (+750 / -1721)
• src/test/Support/JavaScript.cpp (Tests): 387 lines Δ (+277 / -110)
• src/lib/Gen/hbs/Builder.cpp (Source): 255 lines Δ (+164 / -91)

Generated by 🚫 dangerJS against 426e10d

[cppalliance-bot]

An automated preview of the documentation is available at https://1126.mrdocs.prtest2.cppalliance.org/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2025-12-07 20:41:46 UTC