DOC: Sync spell-check dictionary with main branch

[hjmjohnson]

Backport the itk_dict.txt word list from main to release-5.4, adding 433 words accumulated through new features and classes. Uses main's sort order to minimize future merge diffs. Part of #6051.

No behavioral change — the dictionary is a comment spell-checker allowlist only.

[greptile-apps]

Greptile Summary

This PR backports the itk_dict.txt spell-check allowlist from main to release-5.4, adding approximately 433 domain-specific terms accumulated through new features and classes. There is no behavioral change — the file is used solely as a comment spell-checker allowlist.

Confidence Score: 5/5

• Safe to merge — documentation-only change with no code logic or behavioral impact.
• The change is limited to a single spell-checker allowlist file. No code, build logic, or configuration is modified. All findings are P2 or lower (none exist here), so a score of 5 is appropriate.
• No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/itk_dict.txt	Spell-check allowlist updated by backporting 433 words from the main branch to release-5.4. No code logic or behavioral change — purely a dictionary sync.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[main branch\nitk_dict.txt\n~433 new words] -->|backport| B[release-5.4\nitk_dict.txt]
    B --> C{Spell-checker\nCI workflow}
    C -->|allowlist lookup| D[Comment / Doxygen\nspell check passes]

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