fix(imf): decoded-text repetition guard for varying-punctuation loops - #62
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The token-window guard bounds periodic loops, but live int8 output loops with rotating punctuation (phrase + varied separator) never repeats a verbatim window. Cut when the recent 16 decoded chars echo 3+ times. decode_tokens mirrors the TS runtime (% 256).
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Follow-up to #61: the live model's loop rotates punctuation, so no
verbatim token window repeats and the first guard only fired late.
This adds a decoded-text check - when the trailing 16 chars echo 3+
times, generation stops. Also fixes decode over vocab-edge tokens
(mod 256, matching the TS runtime). 91/91 including the parity gate.