refactor: complete three-layer serial refactoring (knowledge→schema→renderer)

Step 1 — Knowledge base: perfect all reference/*.md with type, range, default, unit
- text.md: add DataOrPathProps, path/data, bullet deprecated params
- chart.md: add deprecated section, fix 19 params with missing elements
- slide.md: add bkgd→background deprecated mapping
- output.md: add masterSlide, presLayout

Step 2 — Schema: align schema/presentation.schema.json with KB
- Add catAxisItem and valAxisItem definitions with full sub-property constraints
- Fix 7 enum constraints (barDir, displayBlanksAs, bar3DShape, etc.)
- Add 4 missing fields (verbose, autoPageCharWeight, autoPageLineWeight, notes,
  masterSlide, presLayout)

Step 3 — Translation engine: transform renderers from passthrough to validation
- index.js: add normalizePosition, normalizeColor, validateEnum shared utilities
- All renderers: position validation, color hex normalization, enum validation
- Image: graceful failure handling (catch load errors, warn, continue)
- Chart: chartType enum validation, data parity check
- Table: colspan/rowspan integer validation, border array check
- Full verification: basic.json and full.json generate valid PPTX

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

renderer/shape-renderer.js

@@ -1,5 +1,35 @@
+var { normalizePosition, normalizeColorInOptions, validateEnum } = require('./index');
+
 function renderShape(slide, shapeData) {
-  slide.addShape(shapeData.shapeName, shapeData.options);
+  var opts = {};
+  if (shapeData.options) {
+    for (var k in shapeData.options) {
+      if (shapeData.options.hasOwnProperty(k)) opts[k] = shapeData.options[k];
+    }
+  }
+
+  normalizePosition(opts);
+
+  if (opts.fill && typeof opts.fill === 'object') {
+    normalizeColorInOptions(opts.fill, 'color');
+    validateEnum(opts.fill.type, ['none', 'solid'], 'fill.type');
+  }
+
+  if (opts.line && typeof opts.line === 'object') {
+    normalizeColorInOptions(opts.line, 'color');
+    validateEnum(opts.line.dashType, ['solid', 'dash', 'dashDot', 'lgDash', 'lgDashDot', 'lgDashDotDot', 'sysDash', 'sysDot'], 'line.dashType');
+    validateEnum(opts.line.beginArrowType, ['none', 'arrow', 'diamond', 'oval', 'stealth', 'triangle'], 'line.beginArrowType');
+    validateEnum(opts.line.endArrowType, ['none', 'arrow', 'diamond', 'oval', 'stealth', 'triangle'], 'line.endArrowType');
+  }
+
+  if (opts.shadow && typeof opts.shadow === 'object') {
+    normalizeColorInOptions(opts.shadow, 'color');
+    validateEnum(opts.shadow.type, ['outer', 'inner', 'none'], 'shadow.type');
+  }
+
+  validateEnum(opts.align, ['left', 'center', 'right', 'justify'], 'align');
+
+  slide.addShape(shapeData.shapeName, opts);
 }
 
 module.exports = { renderShape };