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.

docs/target-app-parity.md

@@ -340,6 +340,7 @@ It is evidence of breadth: each item exists. It is not a claim of InDesign-level
 - Stroke styles: striped (thick-thin… and custom bands), wavy and straight-hash strokes now draw on screen and in PDF; named custom stripe/dash/dot styles (`strokeStyle.new/delete/list`, Stroke panel Type list; IDML Striped/Dashed/DottedStrokeStyle).
 - Object ▸ Primary Text Frame (`object.primaryTextFrame`): any text frame's story can become (or stop being) the primary story Smart Text Reflow follows.
 - Column rules (Text Frame Options › Column Rules, `object.textFrameOptions {columnRule, columnRuleWeight, columnRuleColor, columnRuleTint, columnRuleOffset, columnRuleTopInset, columnRuleBottomInset}`, reported by `document.inspect`): a bar centred in each gutter of a multi-column frame, inside the insets and between the columns of right-to-left and vertical frames too, broken around paragraphs that span columns, with weight, colour, tint, horizontal offset and top/bottom insets; on screen, in PDF (tagged as an artifact) and in IDML (`ColumnRule…` attributes of `TextFramePreference`, also in object styles). The dialog shows the frame's options and changes only the fields edited. Rule stroke types and overprint aren't there yet.
+- Auto-size (Text Frame Options › Auto-Size, `object.textFrameOptions {autoSize: off|heightOnly|widthOnly|heightAndWidth|heightAndWidthProportionally, autoSizeReference, useMinimumHeight, minimumHeight, useMinimumWidth, minimumWidth, noLineBreaks}`): the frame fits its text exactly after every edit (typing, pasting, style changes, option changes) in the same undo step, and after IDML import; it grows and shrinks around the reference point, which stays put in spread space for rotated frames too, never below the minimum height/width and never past 10,000 pt. Width Only and No Line Breaks set each paragraph on one line; Height and Width without No Line Breaks keeps the width; Keep Proportions scales both sides until the text fits. IDML keeps all the options (`AutoSizing…`, `…ForAutoSizing` attributes). Not covered: frames of a thread other than the last, vertical frames, type on a path, and multi-column balancing in Keep Proportions.
 - Place a page of an IDML or DesignCraft document (`file.place {layoutPage}`): its objects, stories, styles and swatches as one group (INDD files are not readable).
 - Articles panel (`article.new/add/remove/options/delete/list`): reading order and content of EPUB and HTML exports.
 - Object ▸ Clipping Path (`object.clippingPath {type: alpha|edges, threshold, tolerance}`): traces the placed image and makes the outline the frame. Clipping paths saved in IDML (Detect Edges, Alpha Channel, Photoshop Path, User-Modified Path; Invert) hide the image outside the path on screen and in PDF and survive IDML export; `object.clippingPathOptions` reports, inverts or removes one (Object ▸ Clipping Path ▸ None).