feat: trigger deploy script on SHIPPABLE → DEPLOYED (ADR-007)

Add triggerStoryDeploy to Pool: fetches story's project, runs its
DeployScript via exec.CommandContext, and advances story to DEPLOYED on
success. Wire into checkStoryCompletion with go p.triggerStoryDeploy
after the SHIPPABLE transition. Covered by TestPool_StoryDeploy_RunsDeployScript.

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

1 files changed, 33 insertions, 0 deletions

diff --git a/internal/executor/executor.go b/internal/executor/executor.go
index 22273d9..2ab17a7 100644
--- a/internal/executor/executor.go
+++ b/internal/executor/executor.go
@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"sync"
@@ -457,6 +458,38 @@ func (p *Pool) checkStoryCompletion(ctx context.Context, storyID string) {
 		return
 	}
 	p.logger.Info("story transitioned to SHIPPABLE", "storyID", storyID)
+	go p.triggerStoryDeploy(ctx, storyID)
+}
+
+// triggerStoryDeploy runs the project deploy script for a SHIPPABLE story
+// and advances it to DEPLOYED on success.
+func (p *Pool) triggerStoryDeploy(ctx context.Context, storyID string) {
+	story, err := p.store.GetStory(storyID)
+	if err != nil {
+		p.logger.Error("triggerStoryDeploy: failed to get story", "storyID", storyID, "error", err)
+		return
+	}
+	if story.ProjectID == "" {
+		return
+	}
+	proj, err := p.store.GetProject(story.ProjectID)
+	if err != nil {
+		p.logger.Error("triggerStoryDeploy: failed to get project", "storyID", storyID, "projectID", story.ProjectID, "error", err)
+		return
+	}
+	if proj.DeployScript == "" {
+		return
+	}
+	out, err := exec.CommandContext(ctx, proj.DeployScript).CombinedOutput()
+	if err != nil {
+		p.logger.Error("triggerStoryDeploy: deploy script failed", "storyID", storyID, "script", proj.DeployScript, "output", string(out), "error", err)
+		return
+	}
+	if err := p.store.UpdateStoryStatus(storyID, task.StoryDeployed); err != nil {
+		p.logger.Error("triggerStoryDeploy: failed to update story status", "storyID", storyID, "error", err)
+		return
+	}
+	p.logger.Info("story transitioned to DEPLOYED", "storyID", storyID)
 }
 
 // UndrainingAgent resets the drain state and failure counter for the given agent type.