Add getUncommittedChanges function to detect local git changes

- Implements function to detect staged, unstaged, and untracked files
- Uses git diff --cached, git diff, and git ls-files commands
- Returns deduplicated array of changed file paths
- Includes comprehensive tests with beforeEach setup for git state
- Foundation for making repository content aware of working directory changes

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: Test

www/repository/git-provider.test.ts

@@ -13,6 +13,7 @@ import {
   getContent,
   getDefaultBranch,
   getMatchingTags,
+  getUncommittedChanges,
   lookupTagCommit,
 } from "./git-provider.ts";
 import { Repository, RepositoryRef } from "./types.ts";
@@ -293,6 +294,37 @@ describe("git-provider", () => {
         ]);
       });
     });
+
+    describe("reading uncommitted changes", () => {
+      beforeEach(function*() {
+        // create a directory first
+        yield* ensureDir(join(workspaceDir, "src"));
+        
+        // checkout feature branch
+        yield* cwd(workspaceDir, [
+          $(`git checkout feature-branch`),
+          // create a new file and stage it but don't commit
+          $echo("staged content", "staged-file.txt"),
+          $(`git add staged-file.txt`),
+          // create a new file in directory but don't stage it
+          $echo("unstaged content", "src/unstaged-file.txt"),
+          // modify an existing file but don't stage it
+          $echo("modified content", "file1.txt"),
+        ]);
+      });
+      
+      it("includes staged and unstaged changes", function*() {
+        // verify that calling the function returns a list of both staged and unstaged files
+        const [changes] = yield* cwd(workspaceDir, [
+          getUncommittedChanges(),
+        ]);
+        
+        expect(changes).toContain("staged-file.txt");         // staged new file
+        expect(changes).toContain("src/unstaged-file.txt");   // unstaged new file in directory
+        expect(changes).toContain("file1.txt");               // modified existing file
+        expect(changes).toHaveLength(3);
+      });
+    })
   });
 
   describe("createGitRepository", () => {

www/repository/git-provider.ts

@@ -82,6 +82,37 @@ export function* getMatchingTags(
   }
 }
 
+/**
+ * Get list of files with uncommitted changes (both staged and unstaged)
+ */
+export function* getUncommittedChanges(): Operation<string[]> {
+  try {
+    // Get staged files
+    const stagedResult = yield* $(`git diff --cached --name-only`);
+    const stagedFiles = stagedResult.stdout
+      .split('\n')
+      .filter(line => line.trim().length > 0);
+
+    // Get unstaged files (modified and untracked)
+    const unstagedResult = yield* $(`git diff --name-only`);
+    const modifiedFiles = unstagedResult.stdout
+      .split('\n')
+      .filter(line => line.trim().length > 0);
+
+    // Get untracked files
+    const untrackedResult = yield* $(`git ls-files --others --exclude-standard`);
+    const untrackedFiles = untrackedResult.stdout
+      .split('\n')
+      .filter(line => line.trim().length > 0);
+
+    // Combine all and remove duplicates
+    const allChanges = [...stagedFiles, ...modifiedFiles, ...untrackedFiles];
+    return [...new Set(allChanges)];
+  } catch {
+    return [];
+  }
+}
+
 /**
  * Get commit hash for a tag from a remote repository
  */