F1 (round 1) wrapped the image alt in escapeLinkText, and that helper also guards
the link-form media captions (attachment/pdf/embed). But its character class
covered only stock CommonMark — NOT the Docmost inline EXTENSIONS this same PR
registers on the marked instance: highlight `==x==` (canon #7), math `$x$`
(canon #6), footnote `^[x]` (canon #2). Their triggers `= $ ^` are not CommonMark
punctuation, so an alt or media filename like `x $A$ y`, `use ==bold==`, `^[fn]`,
or `data $A$.csv` was silently turned into a math/highlight/footnote node on
import — the same class of round-trip data loss F1 closed, reintroduced by this
PR's own canon.
Fix: add `= $ ^` to the escapeLinkText class (`/[\\`*_~[\]<&!()=$^]/g`). `\= \$ \^`
decode back to literals (all ASCII punctuation) AND, being escape tokens, stop
the extension tokenizer from matching — verified lossless byte-stable round-trip.
Updated the helper comment to name the two trigger sets (CommonMark + Docmost
inline extensions). Extended the adversarial round-trip tests: image alt gains
`x $A$ y` / `5$ and 10$` / `use ==bold==` / `^[fn]` / `cost $5 == price`; pdf name
gains `data $A$.csv` / `q3 ==final==.pdf` / `5$ and 10$.pdf` / `note ^[x].pdf` —
all byte-stable with the node intact, so the hole can't reopen.
package vitest: 658 passed; tsc clean. git-sync: 268. mcp: 454.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
08222345ef