feat: wire directional alignment predicates into dense DSL grammar

- Add leftAlignedWith/rightAlignedWith/topAlignedWith/bottomAlignedWith
  to lexer TokenKind union and keyword map
- Add to grammar.ts consumeRelation() recognized relation kinds
- Dense DSL users can now write: '.a' leftAlignedWith '.b', etc.
  (previously returned parser error 'Expected relation')

packages/imhotep-dsl/src/grammar.ts

@@ -1139,7 +1139,8 @@ export class GrammarParser {
 
     const relationKinds: Array<Token['kind']> = [
       'leftOf', 'rightOf', 'above', 'below',
-      'alignedWith', 'centeredWithin', 'inside', 'contains', 'overlaps', 'separatedFrom',
+      'alignedWith', 'leftAlignedWith', 'rightAlignedWith', 'topAlignedWith', 'bottomAlignedWith',
+      'centeredWithin', 'inside', 'contains', 'overlaps', 'separatedFrom',
       // Spatial aliases
       'beside', 'nextTo', 'adjacent', 'touching', 'near', 'under', 'within',
     ]

packages/imhotep-dsl/src/lexer.ts

@@ -62,6 +62,10 @@ export type TokenKind =
   | 'contains'
   | 'overlaps'
   | 'separatedFrom'
+  | 'leftAlignedWith'
+  | 'rightAlignedWith'
+  | 'topAlignedWith'
+  | 'bottomAlignedWith'
   // Spatial aliases
   | 'beside'
   | 'nextTo'
@@ -190,6 +194,10 @@ const KEYWORDS: Record<string, TokenKind> = {
   contains: 'contains',
   overlaps: 'overlaps',
   separatedFrom: 'separatedFrom',
+  leftAlignedWith: 'leftAlignedWith',
+  rightAlignedWith: 'rightAlignedWith',
+  topAlignedWith: 'topAlignedWith',
+  bottomAlignedWith: 'bottomAlignedWith',
   // Spatial aliases
   beside: 'beside',
   nextTo: 'nextTo',