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.
  • A comparison of the engines considered is available in Explore Javascript Engines #881 (comment)
• 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

Warning

Commit e40913d (feat: javascript helpers extension) changes 4776 source lines. Consider splitting it into smaller, reviewable chunks.

✨ Highlights

• 🧪 Existing golden tests changed (behavior likely shifted)

🧾 Changes by Scope

Scope	Lines Δ	Lines +	Lines -	Files Δ	Files +	Files ~	Files ↔	Files -
Source	4776	2643	2133	-3	1	7	-	11
Tests	1338	1092	246	2	-	2	-	-
Golden Tests	324	324	-	50	31	-	19	-
CI / Roadmap	321	244	77	9	1	8	-	-
Third-party	312	172	140	-	3	-	-	3
Docs	112	34	78	3	-	3	-	-
Build / Toolchain	34	20	14	3	-	3	-	-
Other	25	3	22	-	-	1	-	1
Total	7242	4532	2710	64	36	24	19	15

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

🔝 Top Files

• src/lib/Support/JavaScript.cpp (Source): 3479 lines Δ (+1884 / -1595)
• src/test/Support/JavaScript.cpp (Tests): 1335 lines Δ (+1091 / -244)
• include/mrdocs/Support/JavaScript.hpp (Source): 428 lines Δ (+206 / -222)

Generated by 🚫 dangerJS against e40913d

[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.

2025-12-17 07:57:28 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (c3dbded) to head (e40913d).
⚠️ Report is 9 commits behind head on develop.

Additional details and impacted files

@@       Coverage Diff       @@
##   develop   #1126   +/-   ##
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