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/text-renderer.js

@@ -1,5 +1,47 @@
+var { normalizePosition, normalizeColor, normalizeColorInOptions, validateEnum } = require('./index');
+
 function renderText(slide, textData) {
-  slide.addText(textData.text, textData.options);
+  var opts = {};
+  if (textData.options) {
+    for (var k in textData.options) {
+      if (textData.options.hasOwnProperty(k)) opts[k] = textData.options[k];
+    }
+  }
+
+  normalizePosition(opts);
+  normalizeColorInOptions(opts, 'color');
+  normalizeColorInOptions(opts, 'highlight');
+
+  if (opts.underline && typeof opts.underline === 'object') {
+    normalizeColorInOptions(opts.underline, 'color');
+  }
+  if (opts.bullet && typeof opts.bullet === 'object') {
+    normalizeColorInOptions(opts.bullet, 'color');
+  }
+  if (opts.glow && typeof opts.glow === 'object') {
+    normalizeColorInOptions(opts.glow, 'color');
+  }
+  if (opts.outline && typeof opts.outline === 'object') {
+    normalizeColorInOptions(opts.outline, 'color');
+  }
+
+  validateEnum(opts.align, ['left', 'center', 'right', 'justify'], 'align');
+  validateEnum(opts.valign, ['top', 'middle', 'bottom'], 'valign');
+  validateEnum(opts.textDirection, ['horz', 'vert', 'vert270', 'wordArtVert'], 'textDirection');
+  validateEnum(opts.vert, ['eaVert', 'horz', 'mongolianVert', 'vert', 'vert270', 'wordArtVert', 'wordArtVertRtl'], 'vert');
+  validateEnum(opts.fit, ['none', 'shrink', 'resize'], 'fit');
+
+  if (typeof opts.strike === 'string') {
+    validateEnum(opts.strike, ['dblStrike', 'sngStrike'], 'strike');
+  }
+  if (opts.underline && opts.underline.style !== undefined) {
+    validateEnum(opts.underline.style, ['dash', 'dashHeavy', 'dashLong', 'dashLongHeavy', 'dbl', 'dotDash', 'dotDashHeave', 'dotDotDash', 'dotDotDashHeavy', 'dotted', 'dottedHeavy', 'heavy', 'none', 'sng', 'wavy', 'wavyDbl', 'wavyHeavy'], 'underline.style');
+  }
+  if (opts.bullet && typeof opts.bullet === 'object' && opts.bullet.type !== undefined) {
+    validateEnum(opts.bullet.type, ['bullet', 'number'], 'bullet.type');
+  }
+
+  slide.addText(textData.text, opts);
 }
 
 module.exports = { renderText };