chore(agent-feedback): file pruned babel helpers reachable from user config

[rturnq]

Files an agent-feedback item against packages/compiler/scripts/bundle.mts › pruneHelpers: the bundled Babel's helper table was trimmed to the four helpers the compiler's own transforms request, but getBaseBabelConfig enables .babelrc/configFile discovery for translated output, so user presets running inside the bundled Babel can request any of the other 118 helpers. A targetless @babel/preset-env fails with Unknown helper defineProperty, and affected apps cannot pin to an older compiler because the Marko 5 vdom translator needs the newer decodeHTML babel-utils export. The item records the failure, the no-pin-escape coupling, and a direction (restore the full table in the node bundle, ~112 KB); no fix is included.

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• agent-feedback/items/2026-08-27-keep-user-reachable-babel-helpers-in-the-bundled.md

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Walkthrough

Adds a bug report for pruneHelpers removing user-reachable helpers from the Node Babel bundle. The report describes failures with targetless @babel/preset-env, including the Unknown helper defineProperty error. It proposes retaining the full helper table in dist/babel.js while preserving pruning in dist/babel.web.js. It also defines reproduction steps and helper-count checks.

Merge Risk: ⚪ Minimal · up to 13177

This PR only documents an existing Babel-helper compatibility issue and introduces no product or production behavior changes; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the bundled Babel helper-pruning issue, its cause, impact, and proposed direction. It matches the changeset.
Title check	✅ Passed	The title clearly identifies the feedback item about user-reachable Babel helpers being pruned. It accurately summarizes the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.76%. Comparing base (b92887e) to head (131778d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4063   +/-   ##
=======================================
  Coverage   90.76%   90.76%           
=======================================
  Files         424      424           
  Lines       20444    20444           
  Branches     3871     3871           
=======================================
  Hits        18557    18557           
  Misses       1325     1325           
  Partials      562      562           

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