Four blocks of prose attributed to §6.4 a sentence that appears nowhere in the draft; replaced with verbatim draft text.

§6.4 requires the relative margin m to be documented, which a source comment does not discharge. `zit commit --help` now states the 15% threshold, with a test that renders drift_margin_pct and requires the help to contain it -- the prose and the constant cannot drift apart.

The config frame's trailing block carries a shape tag, so an extension a reader cannot name costs one re-scan instead of an unreadable config (login, remote and project fields included). Legacy widths still parse.

Names the §7.2 avoid-submanifests predicate: the pragma keys on the setting alone, not the armed disjunction, and that divergence is now visible at the call site.

These four land together because D's deletion and E's addition are interleaved in one region of repository.zig with no hunk boundary between them. check-in: 999efb0fd9 user: dmestas tags: sub-manifest