Merge the chart and EMF+ metafile PRs integrated on land-r2 (#532 #537 #591 #594 #598 #602 #603 #638 #640 #662 #666 #669 #690 #582 #588 #633 #635)

# Conflicts:
#	crates/pptx/src/write/mod.rs
#	crates/pptx/tests/roundtrip.rs

docs/gaps.md

@@ -24,6 +24,7 @@
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (command palette no longer offers Export without a path, #79; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; checklist row stays P so breadth stays 79%; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; checklist letters unchanged, breadth stays 79%, dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previous: minor, chart trendlines round-trip; 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -152,8 +153,8 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### SVG pictures don't render
 - **Evidence:** `crates/render/src/images.rs` decodes through `image` 0.25 (PNG, JPEG, WebP, GIF,
   TIFF, BMP), and EMF/WMF through `deckcraft-metafile` (ported from WordCraft: paths, fills, pens,
-  pattern and hatch brushes, bitmaps and text; rectangle clip regions are applied, EMF+ records are
-  not drawn).
+  pattern and hatch brushes, bitmaps and text; rectangle clip regions are applied, EMF+ only
+  pictures play their EMF+ records).
   Nothing reads SVG; PowerPoint's Insert Icons stores SVG with a PNG fallback.
 - **Impact:** SVG icons show only their raster fallback, and SVG files can't be inserted.
 - **Estimate:** 4–8 h (an SVG renderer through `resvg`-style crates).
@@ -219,10 +220,20 @@ Detail in [file-format-parity.md](file-format-parity.md).
 
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
-  chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
-  whisker) aren't read. Trendlines round-trip (`corpus_charts.rs`) and are not drawn. A combo
-  chart's secondary value axis is read (`y2_*`, `Series.secondary_axis`) and is not written back
-  when the chart is rebuilt.
+  chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, Pareto,
+  box & whisker) are read, drawn, inserted, edited and saved as `chartEx` (kept unchanged, else
+  written from the model, with a plain chart fallback). Waterfalls float and total, funnels,
+  treemaps (squarified, nested by level with group banners) and sunbursts (one ring per level)
+  have their own layouts, histograms and Paretos bin their data (count, width or Scott's rule),
+  and box & whisker charts use exclusive or inclusive quartiles with 1.5 IQR whiskers. Region maps are kept
+  (their cached geography too, also through edits) and drawn as value-coloured tiles with a
+  colour scale, since DeckCraft ships no map boundaries. Radar charts are drawn polar (filled
+  or lines), stock charts as high-low lines with close dashes or up/down bars and saved as
+  `c:stockChart`, and combo charts start as columns with a line. Trendlines round-trip
+  (`corpus_charts.rs`) and are drawn: linear, exponential, logarithmic, polynomial, power and
+  moving average, with forecast and the equation and R² label. A moving average is drawn with
+  neither label. A combo chart's secondary value axis is read (`y2_*`,
+  `Series.secondary_axis`) and is not written back when the chart is rebuilt.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 
@@ -409,6 +420,8 @@ Detail in [localization-parity.md](localization-parity.md).
 | 2026-10-13 | minor | Benchmark suite (`cargo xtask bench`, `deckcraft-cli bench`): the performance gap is now frame rate and a PowerPoint comparison |
 | 2026-10-14 | minor | Owned corpus `corpus_media.rs`: 3-D model parts and animation bounce end now round-trip. The real-deck corpus and #70/#74/#77 stay open |
 | 2026-10-14 | trivial | Corpus slice: themes, masters, effects and links; text Mouse Over actions round-trip |
+| 2026-10-14 | trivial | A moving average trendline is drawn without an equation or an R² label |
+| 2026-10-14 | minor | Chart trendlines are drawn (six types, forecast, equation and R²). The charts gap stays open for the data grid, chartex and secondary-axis export; the real-deck corpus gap stays open |
 | 2026-10-14 | minor | Chart trendlines round-trip. The real-deck corpus gap stays open; secondary-axis export and drawing trendlines stay in the charts gap |
 | 2026-10-14 | trivial | 3-D contours |
 | 2026-10-14 | trivial | 3-D light rigs and materials; extrusion sides lit per side |