fix(telegram): parse Ogg Opus packet offset - #6872

Automated daily review pass.

looks_like_ogg_opus itself looks correct: the fixed-header/version/continuation checks, the segment-table bounds arithmetic (with checked_add guarding the page-length sum), and the first-packet-length walk that stops at the first lacing value < 255 all match the Ogg framing spec, and the truncation test (ogg_opus_detection_rejects_every_truncation_without_panicking) exercises every prefix of a valid page plus several malformed inputs. No off-by-one or panic path found. Changelog fragment (changelog.d/fixed/6872-telegram-ogg-opus-detection.md) is correctly formatted and attributed.

One minor, non-blocking note: the body of test(telegram): cover every truncation of an Ogg/Opus page (d13f0f3) is hard-wrapped at a fixed column across four lines, mid-sentence. CLAUDE.md's prose-wrapping rule ("Prose wrapping: no column limit; break only at sentence boundaries") explicitly lists commit message bodies as in scope. Not asking for a history rewrite here — just flagging for future commit messages on this branch/series.

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