Add local-only mode for contracts with patch export support (#34)

* Add local_only flag to contracts database and models

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Task completion checkpoint

* Skip automatic completion actions in local_only mode

Add `local_only` flag to contracts that prevents automatic completion
actions (branch, merge, pr) from executing when tasks complete. This
allows users to manually handle code changes via patch files or other
means when operating in local-only mode.

Changes:
- Add `local_only` field to Contract model and request types
- Add database migration for the new column
- Add `local_only` parameter to SpawnTask command in both state.rs and
  daemon protocol.rs
- Modify task manager to skip completion action execution when
  `local_only` is true, with appropriate logging
- Pass `local_only` flag through all task spawning paths:
  - mesh_supervisor.rs (task spawn, retry, resume)
  - mesh.rs (task start, reassign, continue)
  - mesh_chat.rs (run task)
  - contract_chat.rs (run task)
- Update repository create/update functions to handle `local_only`

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Task completion checkpoint

* Implement core patch export system

Add functionality to create uncompressed, human-readable git patches
for export. This enables users to generate patches that can be manually
applied or shared, without the compression used for internal checkpoints.

Changes:
- Add ExportPatchResult struct with patch content, file count, and line stats
- Add create_export_patch() function that generates diffs against a base SHA
- Add get_head_sha() utility function
- Add parse_diff_stat() helper to extract line counts from git output
- Add CreateExportPatch command to daemon protocol
- Add ExportPatchCreated response message to protocol
- Add handler in task manager to process export patch requests
- Add server-side handling to broadcast patch results to UI

The export patch system automatically finds the merge-base when no base
SHA is provided, trying upstream tracking branch first, then common
default branches (origin/main, origin/master, main, master).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Task completion checkpoint

* Add GitActionsPanel frontend component

* Add WorktreeFilesPanel and PatchesListPanel components

* Add local-only mode toggle to contract creation

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 303 insertions, 0 deletions

diff --git a/makima/src/daemon/storage/patch.rs b/makima/src/daemon/storage/patch.rs
index 45624b5..0da4eda 100644
--- a/makima/src/daemon/storage/patch.rs
+++ b/makima/src/daemon/storage/patch.rs
@@ -141,6 +141,223 @@ pub async fn get_parent_sha(worktree_path: &Path) -> Result<String, PatchError>
     Ok(String::from_utf8_lossy(&output.stdout).trim().to_string())
 }
 
+/// Get the current HEAD commit SHA from a worktree.
+pub async fn get_head_sha(worktree_path: &Path) -> Result<String, PatchError> {
+    let output = Command::new("git")
+        .current_dir(worktree_path)
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .await
+        .map_err(|e| PatchError::GitCommand(format!("Failed to get HEAD SHA: {}", e)))?;
+
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        return Err(PatchError::GitCommand(format!(
+            "git rev-parse HEAD failed: {}",
+            stderr
+        )));
+    }
+
+    Ok(String::from_utf8_lossy(&output.stdout).trim().to_string())
+}
+
+/// Result of creating an export patch.
+#[derive(Debug, Clone)]
+pub struct ExportPatchResult {
+    /// The uncompressed, human-readable patch content.
+    pub patch_content: String,
+    /// Number of files changed in the patch.
+    pub files_count: usize,
+    /// Number of lines added.
+    pub lines_added: usize,
+    /// Number of lines removed.
+    pub lines_removed: usize,
+    /// The base commit SHA that the patch is diffed against.
+    pub base_commit_sha: String,
+}
+
+/// Create an uncompressed git diff patch for export.
+///
+/// This creates a human-readable patch that can be applied manually or
+/// shared as a file. Unlike `create_patch`, this version is not compressed
+/// and is suitable for display or export.
+///
+/// If `base_sha` is provided, the diff is between that commit and HEAD.
+/// If `base_sha` is None, it attempts to find the merge-base with the default branch
+/// or falls back to diffing uncommitted changes against HEAD.
+pub async fn create_export_patch(
+    worktree_path: &Path,
+    base_sha: Option<&str>,
+) -> Result<ExportPatchResult, PatchError> {
+    // Determine the base SHA to diff against
+    let resolved_base_sha = match base_sha {
+        Some(sha) => sha.to_string(),
+        None => {
+            // Try to find the merge-base with the default branch
+            // First, try to get the upstream tracking branch
+            let upstream_result = Command::new("git")
+                .current_dir(worktree_path)
+                .args(["rev-parse", "--abbrev-ref", "--symbolic-full-name", "@{u}"])
+                .output()
+                .await;
+
+            let base = if let Ok(output) = upstream_result {
+                if output.status.success() {
+                    let upstream = String::from_utf8_lossy(&output.stdout).trim().to_string();
+                    // Get merge-base with upstream
+                    let merge_base = Command::new("git")
+                        .current_dir(worktree_path)
+                        .args(["merge-base", "HEAD", &upstream])
+                        .output()
+                        .await;
+
+                    if let Ok(mb_output) = merge_base {
+                        if mb_output.status.success() {
+                            Some(String::from_utf8_lossy(&mb_output.stdout).trim().to_string())
+                        } else {
+                            None
+                        }
+                    } else {
+                        None
+                    }
+                } else {
+                    None
+                }
+            } else {
+                None
+            };
+
+            // If we couldn't find upstream, try common default branches
+            let base = if base.is_none() {
+                let default_branches = ["origin/main", "origin/master", "main", "master"];
+                let mut found_base = None;
+
+                for branch in default_branches {
+                    let merge_base = Command::new("git")
+                        .current_dir(worktree_path)
+                        .args(["merge-base", "HEAD", branch])
+                        .output()
+                        .await;
+
+                    if let Ok(output) = merge_base {
+                        if output.status.success() {
+                            found_base = Some(String::from_utf8_lossy(&output.stdout).trim().to_string());
+                            break;
+                        }
+                    }
+                }
+                found_base
+            } else {
+                base
+            };
+
+            // If still nothing, get the first commit or use HEAD~1
+            base.unwrap_or_else(|| {
+                // This will be used, but if HEAD~1 doesn't exist (only one commit),
+                // git diff will handle it gracefully
+                "HEAD~1".to_string()
+            })
+        }
+    };
+
+    // Get diff stats using --stat
+    let stat_output = Command::new("git")
+        .current_dir(worktree_path)
+        .args(["diff", "--stat", &resolved_base_sha, "HEAD"])
+        .output()
+        .await
+        .map_err(|e| PatchError::GitCommand(format!("Failed to run git diff --stat: {}", e)))?;
+
+    // Parse the stat output to get line counts
+    let (lines_added, lines_removed) = if stat_output.status.success() {
+        parse_diff_stat(&String::from_utf8_lossy(&stat_output.stdout))
+    } else {
+        (0, 0)
+    };
+
+    // Get the actual diff content
+    let diff_output = Command::new("git")
+        .current_dir(worktree_path)
+        .args(["diff", &resolved_base_sha, "HEAD"])
+        .output()
+        .await
+        .map_err(|e| PatchError::GitCommand(format!("Failed to run git diff: {}", e)))?;
+
+    if !diff_output.status.success() {
+        let stderr = String::from_utf8_lossy(&diff_output.stderr);
+        return Err(PatchError::GitCommand(format!("git diff failed: {}", stderr)));
+    }
+
+    let patch_content = String::from_utf8_lossy(&diff_output.stdout).to_string();
+
+    // Check for empty patch
+    if patch_content.trim().is_empty() {
+        return Err(PatchError::EmptyPatch);
+    }
+
+    // Count files changed
+    let files_output = Command::new("git")
+        .current_dir(worktree_path)
+        .args(["diff", "--name-only", &resolved_base_sha, "HEAD"])
+        .output()
+        .await
+        .map_err(|e| PatchError::GitCommand(format!("Failed to count files: {}", e)))?;
+
+    let files_count = if files_output.status.success() {
+        String::from_utf8_lossy(&files_output.stdout)
+            .lines()
+            .filter(|l| !l.is_empty())
+            .count()
+    } else {
+        0
+    };
+
+    Ok(ExportPatchResult {
+        patch_content,
+        files_count,
+        lines_added,
+        lines_removed,
+        base_commit_sha: resolved_base_sha,
+    })
+}
+
+/// Parse git diff --stat output to extract lines added and removed.
+/// The last line typically looks like: " 3 files changed, 45 insertions(+), 12 deletions(-)"
+fn parse_diff_stat(stat_output: &str) -> (usize, usize) {
+    let mut lines_added = 0;
+    let mut lines_removed = 0;
+
+    // Look for the summary line at the end
+    for line in stat_output.lines().rev() {
+        let line = line.trim();
+        if line.contains("changed") || line.contains("insertion") || line.contains("deletion") {
+            // Parse insertions
+            if let Some(idx) = line.find("insertion") {
+                let before = &line[..idx];
+                if let Some(num_str) = before.split_whitespace().last() {
+                    if let Ok(num) = num_str.parse::<usize>() {
+                        lines_added = num;
+                    }
+                }
+            }
+            // Parse deletions
+            if let Some(idx) = line.find("deletion") {
+                let before = &line[..idx];
+                if let Some(num_str) = before.split(',').last() {
+                    if let Some(num_str) = num_str.trim().split_whitespace().next() {
+                        if let Ok(num) = num_str.parse::<usize>() {
+                            lines_removed = num;
+                        }
+                    }
+                }
+            }
+            break;
+        }
+    }
+
+    (lines_added, lines_removed)
+}
+
 /// Checkout a specific commit in the worktree.
 pub async fn checkout_commit(worktree_path: &Path, sha: &str) -> Result<(), PatchError> {
     let output = Command::new("git")
@@ -290,4 +507,90 @@ mod tests {
         let result = create_patch(path, &head_sha).await;
         assert!(matches!(result, Err(PatchError::EmptyPatch)));
     }
+
+    #[tokio::test]
+    async fn test_create_export_patch() {
+        let dir = setup_test_repo().await;
+        let path = dir.path();
+
+        // Get the initial commit SHA before making changes
+        let initial_sha = get_head_sha(path).await.unwrap();
+
+        // Make some changes and commit
+        fs::write(path.join("file.txt"), "modified content").unwrap();
+        fs::write(path.join("new_file.txt"), "new file content").unwrap();
+        Command::new("git")
+            .current_dir(path)
+            .args(["add", "."])
+            .output()
+            .await
+            .unwrap();
+        Command::new("git")
+            .current_dir(path)
+            .args(["commit", "-m", "changes for export"])
+            .output()
+            .await
+            .unwrap();
+
+        // Create export patch with explicit base
+        let result = create_export_patch(path, Some(&initial_sha)).await.unwrap();
+
+        // Verify the result
+        assert!(!result.patch_content.is_empty());
+        assert_eq!(result.files_count, 2); // file.txt and new_file.txt
+        assert!(result.lines_added > 0);
+        assert_eq!(result.base_commit_sha, initial_sha);
+
+        // The patch should contain diff headers
+        assert!(result.patch_content.contains("diff --git"));
+        assert!(result.patch_content.contains("new_file.txt"));
+    }
+
+    #[tokio::test]
+    async fn test_create_export_patch_no_base() {
+        let dir = setup_test_repo().await;
+        let path = dir.path();
+
+        // Make a second commit so we have something to diff
+        fs::write(path.join("file.txt"), "modified").unwrap();
+        Command::new("git")
+            .current_dir(path)
+            .args(["add", "."])
+            .output()
+            .await
+            .unwrap();
+        Command::new("git")
+            .current_dir(path)
+            .args(["commit", "-m", "second commit"])
+            .output()
+            .await
+            .unwrap();
+
+        // Create export patch without explicit base (will use HEAD~1)
+        let result = create_export_patch(path, None).await.unwrap();
+
+        // Verify the result
+        assert!(!result.patch_content.is_empty());
+        assert_eq!(result.files_count, 1);
+        assert!(result.patch_content.contains("diff --git"));
+    }
+
+    #[tokio::test]
+    async fn test_parse_diff_stat() {
+        // Test the parse_diff_stat function with various formats
+        let stat1 = " 3 files changed, 45 insertions(+), 12 deletions(-)";
+        let (added, removed) = parse_diff_stat(stat1);
+        assert_eq!(added, 45);
+        assert_eq!(removed, 12);
+
+        let stat2 = " 1 file changed, 10 insertions(+)";
+        let (added, removed) = parse_diff_stat(stat2);
+        assert_eq!(added, 10);
+        assert_eq!(removed, 0);
+
+        let stat3 = " 2 files changed, 5 deletions(-)";
+        let (added, removed) = parse_diff_stat(stat3);
+        assert_eq!(added, 0);
+        assert_eq!(removed, 5);
+    }
 }