feat: Added Kolmar cipher operation

[1mpuser]

Description
Adds a new operation, "Kolmar Cipher" (Encode/Decode), based on a custom Russian-language
substitution cipher originally created and published at kolmarchik.ru. The cipher derives a
grid of "boxes" from user-supplied Russian code word(s) (via syllable splitting and a digit-based
capacity rule per letter), then distributes the plaintext's Cyrillic letters into that grid in a
round-robin fill order, dynamically opening new rows as needed. Decode reverses the process to
recover the original letter sequence (spaces are not preserved, matching the original site's
behaviour).

Options added:

• Code words (string)
• Mode (Encode / Decode)

Existing Issue
N/A — this is not tied to an existing issue.

AI disclosure
I used Claude (Anthropic) to help port the algorithm into CyberChef's operation structure/
conventions (Operation class boilerplate, args config, following the pattern of existing cipher
operations like ROT13.mjs/VigenereEncode.mjs) and to help draft the test cases. The cipher
algorithm itself was not designed or written by AI — it's a pre-existing algorithm from
kolmarchik.ru, which I reverse-engineered/ported (with the original source's own JS as reference)
rather than having AI invent the cipher logic. I've reviewed the implementation myself and can
answer questions about how it works.

Test Coverage
Added tests in tests/operations/KolmarCipher.mjs covering: basic encode/decode round-trip,
manual syllable splitting via hyphen, multi-row/multi-codeword output, non-Cyrillic character
stripping, empty input, and missing code words on decode.

[CLAassistant]

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