feat: add deployment status endpoint for tasks

Adds GET /api/tasks/{id}/deployment-status which checks whether the
currently-deployed server binary includes the fix commits from the
task's latest execution. Uses git merge-base --is-ancestor to compare
commit hashes against the running version.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/internal/deployment/deployment.go b/internal/deployment/deployment.go
new file mode 100644
index 0000000..0ba436d
--- /dev/null
+++ b/internal/deployment/deployment.go
@@ -0,0 +1,43 @@
+package deployment
+
+import (
+	"os/exec"
+
+	"github.com/thepeterstone/claudomator/internal/task"
+	"github.com/thepeterstone/claudomator/internal/version"
+)
+
+// Status describes whether the currently-deployed server includes a set of fix commits.
+type Status struct {
+	DeployedCommit string           `json:"deployed_commit"`
+	FixCommits     []task.GitCommit `json:"fix_commits"`
+	IncludesFix    bool             `json:"includes_fix"`
+}
+
+// Check returns the deployment status for a set of fix commits given the project directory.
+// It uses `git merge-base --is-ancestor` to check whether each fix commit is an ancestor
+// of the deployed server's commit. Returns a non-nil Status in all cases; IncludesFix is
+// false when the check cannot be performed (missing git, "dev" version, no commits, etc.).
+func Check(fixCommits []task.GitCommit, projectDir string) *Status {
+	deployedCommit := version.Version()
+	status := &Status{
+		DeployedCommit: deployedCommit,
+		FixCommits:     fixCommits,
+	}
+	if deployedCommit == "dev" || projectDir == "" || len(fixCommits) == 0 {
+		return status
+	}
+
+	// All fix commits must be ancestors of (or equal to) the deployed commit.
+	for _, commit := range fixCommits {
+		if commit.Hash == "" {
+			continue
+		}
+		cmd := exec.Command("git", "-C", projectDir, "merge-base", "--is-ancestor", commit.Hash, deployedCommit)
+		if err := cmd.Run(); err != nil {
+			return status
+		}
+	}
+	status.IncludesFix = true
+	return status
+}