Merge #180: text frame auto-size grows and shrinks frames to fit their text

text-autosize 60551322.

Conflict: crates/doc/src/item.rs: next's reference-point doc and default auto_size_ref 4 (centre, as IDML leaves it) plus the branch's minimum-size and No Line Breaks fields
Conflict: crates/engine/src/lib.rs: autosize pass before next's record_undo_step on the success path; bump_revision for next's global revisions
Conflict: crates/engine/src/cmd/interchange.rs: next's grep_style_warnings and .indd comment plus the branch's autosize::apply on import
Conflict: crates/engine/src/cmd/object.rs: branch's textFrameOptions params doc with next's firstBaseline values
Conflict: ROADMAP.md: progress log both
Conflict: docs/gaps.md: next's optical kerning wording with the branch's auto-size note on #180

docs/gaps.md

@@ -65,7 +65,7 @@ Kind: **F** feature · **U** UI/UX · **T** typography · **FF** file format ·
   black-box, results kept under `plan/`) and by DesignCraft, comparing line breaks, overset and
   frame fit. Known differences: optical kerning is an outline-based approximation, not Adobe's
   algorithm (#181); a frame goes overset when descenders don't fit, InDesign needs only the baseline
-  (#180); setting the text language was missing (#130; Language is now in Properties, #145, the issue is still open); "hyphenation doesn't work"
+  (#180; auto-size frames fit their text on import); setting the text language was missing (#130; Language is now in Properties, #145, the issue is still open); "hyphenation doesn't work"
   (#87).
 - **Impact:** an opened IDML reflows: different line breaks, different page count, overset text.
   Professionals notice on the first page.