chore(test): raise the heap ceiling on non-coverage test scripts

[PierreBrisorgueil]

Jest with ESM modules leaks memory per suite, so large suites crash with a heap error around Node's default 4 GB limit. Every non-coverage test script now sets --max-old-space-size=8192 (a ceiling, not a reservation). Coverage scripts keep their own flags. MIGRATIONS.md tells downstream projects to apply the same change to their own package.json.

Closes #3948 · epic #4019

https://claude.ai/code/session_015td7sshifbRrYrHbKgheiR

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• MIGRATIONS.md
• package.json

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.48%. Comparing base (7842528) to head (3a8c217).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4144   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files         170      170           
  Lines        6036     6036           
  Branches     1946     1947    +1     
=======================================
  Hits         5703     5703           
  Misses        271      271           
  Partials       62       62           

Flag	Coverage Δ
integration	64.26% <ø> (ø)
unit	79.77% <ø> (ø)

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