chore(sdk): 1.6.0 [skip ci]

### What's New

**Math equation rendering** — Convert OMML to native MathML for accents, radicals, limits, equations arrays, matrix tables, group characters, phantoms, n-ary operators, and pre-subscripts.

**Odd/even header-footer support** — Enable alternating headers and footers per page via OOXML `w:evenAndOddHeaders` with correct margin calculation across sections.

**Toolbar headless API** — Query toolbar state and execute formatting commands programmatically via `state()` and `execute()` methods without visual rendering.

**Document extract API** — Export all document content as `doc.extract()` with stable IDs for RAG workflows — blocks with text, comments with anchored references, tracked changes with excerpts.

**Content control text range wrapping** — Wrap arbitrary text selections in content controls via `contentControls.create({ at })` without dropping to editor internals.

**Independent track changes mode** — Add `modules.trackChanges.replacements: 'independent'` to treat each insertion and deletion as separate revisions matching Word's ECMA-376 model (default: paired for Google Docs behavior).

**Column line separators** — Render column dividers (`w:sep`) per region on pages with multi-column sections and continuous breaks.

### Improvements

**Track changes configuration** — Consolidate track changes config under `modules.trackChanges` with automatic backward compatibility for legacy `config.trackChanges` and `config.layoutEngineOptions.trackedChanges` keys.

**Word-level text diffing** — Granular text change tracking for collaborative editing with accurate representation of what changed.

**Math in function-wrapped limits** — Preserve italic styling on variables inside limit expressions when wrapped in function names (e.g., `lim_(n→∞)`).

**Tab alignment for TOC styles** — Compute tab stops correctly on TOC1 paragraphs so leaders and page numbers align as authored.

**Justified text with hanging indents** — Fix character overlap and selection drift when first-line indent combines with paragraph justification.

**Collaboration WebSocket parameters** — Forward custom query parameters to y-websocket and Hocuspocus providers via `collaboration.params` field.

**Toolbar font option styling** — Auto-derive `fontFamily` from label or key so minimal `{ label, key }` font definitions render in their own typeface without explicit `props.style`.

**Export type safety** — Browser consumers now get `Promise<Blob>` by default from `exportDocx()`, Node headless consumers opt in with `exportDocx<Buffer>()`.

**CSS isolation** — Wrap all bundled SuperDoc CSS in `@layer superdoc` cascade layer so consumer styles always win regardless of import order.

### Fixes

**Footnote overflow on multi-page sections** — Fix footnote fragments rendering past page bottoms (150+ pixels into footers) when multiple footnotes compete for space with oscillating reserve vectors.

**Column separator regions** — Render per-region separators on pages with continuous breaks changing column layout mid-page instead of a single full-page overlay.

**Centered inline images in indented paragraphs** — Account for paragraph indents in centering math so `w:jc=center` on shapes inside indented text positions them correctly.

**Table cell selection in collaboration** — Fix table cell redraw and block cache invalidation when typing inside cells in SDTs during active editing.

**Image containment in cells** — Ensure images stay within table cell boundaries instead of overflowing.

**evenAndOddHeaders parsing** — Parse `w:evenAndOddHeaders ST_OnOff` values correctly and use document page number (not section-relative) for even/odd selection.

**Serif fallback fonts** — Apply serif fallback for serif-like fonts in font stacks.

**Comment bubble replacement text** — Display replacement text correctly in comment bubbles for tracked changes.

**Tracked changes sync on collab undo/redo** — Resync comment bubbles when peer undo/redo replays tracked change marks.

**Collaboration export data loss** — Persist `settings.xml`, custom XML parts, and endnotes after export in collab sessions.

**Math edge cases** — Handle surrogate pairs in math text (astral-plane alphanumerics), respect function-name italic suppression per ECMA-376, strip alignment markers from equation arrays, parse all ST_OnOff variants on phantom/nary/borderBox elements.

**Python async transport buffer** — Raise asyncio `StreamReader` buffer to 64 MiB so responses exceeding 64 KiB don't fail with `StreamReader limit exceeded` error.

**Async transport teardown** — Fix residual races in async reader cleanup and orphaned host processes on buffer overflow or connection failure.

Author: semantic-release-bot

packages/sdk/langs/node/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@superdoc-dev/sdk",
-  "version": "1.5.1",
+  "version": "1.6.0",
   "private": false,
   "type": "module",
   "main": "./dist/index.cjs",

packages/sdk/langs/node/platforms/sdk-darwin-arm64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@superdoc-dev/sdk-darwin-arm64",
-  "version": "1.5.1",
+  "version": "1.6.0",
   "os": [
     "darwin"
   ],

packages/sdk/langs/node/platforms/sdk-darwin-x64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@superdoc-dev/sdk-darwin-x64",
-  "version": "1.5.1",
+  "version": "1.6.0",
   "os": [
     "darwin"
   ],

packages/sdk/langs/node/platforms/sdk-linux-arm64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@superdoc-dev/sdk-linux-arm64",
-  "version": "1.5.1",
+  "version": "1.6.0",
   "os": [
     "linux"
   ],

packages/sdk/langs/node/platforms/sdk-linux-x64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@superdoc-dev/sdk-linux-x64",
-  "version": "1.5.1",
+  "version": "1.6.0",
   "os": [
     "linux"
   ],

packages/sdk/langs/node/platforms/sdk-windows-x64/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@superdoc-dev/sdk-windows-x64",
-  "version": "1.5.1",
+  "version": "1.6.0",
   "os": [
     "win32"
   ],

packages/sdk/langs/python/platforms/superdoc-sdk-cli-darwin-arm64/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "superdoc-sdk-cli-darwin-arm64"
-version = "1.5.1"
+version = "1.6.0"
 description = "SuperDoc CLI binary for macOS ARM64 (Apple Silicon)"
 readme = "README.md"
 requires-python = ">=3.9"

packages/sdk/langs/python/platforms/superdoc-sdk-cli-darwin-x64/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "superdoc-sdk-cli-darwin-x64"
-version = "1.5.1"
+version = "1.6.0"
 description = "SuperDoc CLI binary for macOS x64 (Intel)"
 readme = "README.md"
 requires-python = ">=3.9"

packages/sdk/langs/python/platforms/superdoc-sdk-cli-linux-arm64/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "superdoc-sdk-cli-linux-arm64"
-version = "1.5.1"
+version = "1.6.0"
 description = "SuperDoc CLI binary for Linux ARM64"
 readme = "README.md"
 requires-python = ">=3.9"

packages/sdk/langs/python/platforms/superdoc-sdk-cli-linux-x64/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "superdoc-sdk-cli-linux-x64"
-version = "1.5.1"
+version = "1.6.0"
 description = "SuperDoc CLI binary for Linux x64"
 readme = "README.md"
 requires-python = ">=3.9"