Describe Definition of Done for the code changes

[sequba]

Adding Definition of Done for the code changes to the DEV_DOCS.md

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Note

Low Risk
Documentation-only change that adds contribution/process guidance; no runtime behavior or data/security impact.

Overview
Adds a new "Definition of Done" section to DEV_DOCS.md describing what production-code PRs must include before review (code changes incl. i18n packs when relevant, tests expectations for internal vs. external contributors, related docs/migration guide updates, JSDoc/technical docs, changelog entry, and PR description).

^{Written by Cursor Bugbot for commit 0d7351f. This will update automatically on new commits. Configure here.}

[github-actions]

Performance comparison of head (0d7351f) vs base (266089d)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 501.35 | 492.18 | -1.83%
                                      Sheet B |  159.5 | 160.74 | +0.78%
                                      Sheet T | 140.27 | 138.65 | -1.15%
                                Column ranges | 468.08 | 463.48 | -0.98%
Sheet A:  change value, add/remove row/column |  15.02 |  15.58 | +3.73%
 Sheet B: change value, add/remove row/column | 131.35 | 129.64 | -1.30%
                   Column ranges - add column | 149.45 | 151.43 | +1.32%
                Column ranges - without batch | 444.64 | 445.52 | +0.20%
                        Column ranges - batch | 115.15 | 114.22 | -0.81%

[marcin-kordas-hoc]

Thanks! This is very helpful as a checklist.

Two things I used to forget — would it make sense to mention them here too?

• tests go in hyperformula-tests (not the public repo)
• i18n translations for new functions (17 language files)

Or maybe that's too specific and better left for the function implementation workflow?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.18%. Comparing base (266089d) to head (0d7351f).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1642   +/-   ##
========================================
  Coverage    97.18%   97.18%           
========================================
  Files          172      172           
  Lines        14845    14845           
  Branches      3264     3264           
========================================
  Hits         14427    14427           
  Misses         418      418           

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