Add Git source classes for various commit references

Author: butschster

context.json

@@ -12,8 +12,7 @@
         {
           "type": "git_diff",
           "description": "Recent Commits (Last 1)",
-          "commit": "stash",
-          "filePattern": "*.php",
+          "commit": "staged",
           "notPath": [
             "vendor",
             "tests"
@@ -35,6 +34,20 @@
         }
       ]
     },
+    {
+      "description": "Git finder.",
+      "outputPath": "git_diff.md",
+      "sources": [
+        {
+          "type": "file",
+          "sourcePaths": [
+            "src/Fetcher/Git",
+            "src/Fetcher/FinderResult"
+          ],
+          "filePattern": "*.php"
+        }
+      ]
+    },
     {
       "description": "Context generator tests.",
       "outputPath": "tests.md",

json-schema.json

@@ -483,7 +483,20 @@
             "yesterday",
             "last-2weeks",
             "last-quarter",
-            "last-year"
+            "last-year",
+            "stash",
+            "stash-last",
+            "stash-1",
+            "stash-2",
+            "stash-3",
+            "stash-all",
+            "stash-latest-2",
+            "stash-latest-3",
+            "stash-latest-5",
+            "stash-before-pull",
+            "stash-wip",
+            "stash-untracked",
+            "stash-index"
           ],
           "description": "Git commit range (e.g., 'HEAD~5..HEAD')",
           "default": "staged"