Build workspace agent, capability graph, and versioned cutovers

grammar/QuixosLock.g4

@@ -1,17 +1,22 @@
 grammar QuixosLock;
 
 document
-  : QUIXOS_LOCK VERSION INTEGER LBRACE quixosEntry resourceEntry* RBRACE EOF
+  : QUIXOS_LOCK FRAGMENT? VERSION INTEGER LBRACE
+    (quixosEntry | importEntry | resourceEntry)* RBRACE EOF
   ;
 
 quixosEntry
-  : QUIXOS SOURCE sourceBlock
+  : QUIXOS SOURCE quixosSourceBlock
   ;
 
 resourceEntry
   : resourceKind identifier SOURCE sourceBlock
   ;
 
+importEntry
+  : IMPORT stringLiteral SEMI
+  ;
+
 resourceKind
   : INTERFACE
   | PACKAGE
@@ -24,6 +29,20 @@ sourceBlock
     RBRACE
   ;
 
+quixosSourceBlock
+  : LBRACE
+    REPOSITORY stringLiteral SEMI
+    (POLICY sourcePolicy SEMI REF stringLiteral SEMI)?
+    COMMIT stringLiteral SEMI
+    RBRACE
+  ;
+
+sourcePolicy
+  : PINNED
+  | TRACK_RELEASE
+  | TRACK_DEVELOPMENT
+  ;
+
 identifier
   : IDENTIFIER
   ;
@@ -33,6 +52,7 @@ stringLiteral
   ;
 
 QUIXOS_LOCK: 'quixos-lock';
+FRAGMENT: 'fragment';
 VERSION: 'version';
 QUIXOS: 'quixos';
 SOURCE: 'source';
@@ -40,6 +60,12 @@ INTERFACE: 'interface';
 PACKAGE: 'package';
 REPOSITORY: 'repository';
 COMMIT: 'commit';
+POLICY: 'policy';
+REF: 'ref';
+PINNED: 'pinned';
+TRACK_RELEASE: 'track-release';
+TRACK_DEVELOPMENT: 'track-development';
+IMPORT: 'import';
 
 LBRACE: '{';
 RBRACE: '}';