fix(workflow_run_trigger): 204 dispatch is success; resolve run via listing (#41)

Gitea's workflow_dispatch endpoint returns 204 No Content with no Location
header. DispatchWorkflow required that header, so every successful dispatch
errored with "missing Location header" and never yielded a run ID — making
the tool unusable for CAD dispatch.

- DispatchWorkflow now returns error-only; 204 = success, no Location needed.
  Body already carried ref+inputs; kept and covered by test.
- Tool snapshots the newest existing workflow_dispatch run before dispatch,
  then polls ListWorkflowRuns after and returns the newest run with ID above
  that baseline (avoids returning a stale prior run). Falls back to an honest
  "dispatched, run not yet registered" result rather than failing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/gitea/workflows_test.go

@@ -14,6 +14,9 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+// Gitea's dispatch endpoint returns 204 No Content with NO Location header.
+// Dispatch must succeed and forward ref+inputs in the body; the run ID is
+// resolved separately by the tool via ListWorkflowRuns.
 func TestDispatchWorkflow(t *testing.T) {
 	var gotBody []byte
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -22,18 +25,17 @@ func TestDispatchWorkflow(t *testing.T) {
 		var err error
 		gotBody, err = io.ReadAll(r.Body)
 		assert.NoError(t, err)
-		w.Header().Set("Location", "/api/v1/repos/o/r/actions/runs/789")
+		// No Location header — matches real Gitea.
 		w.WriteHeader(http.StatusNoContent)
 	}))
 	defer srv.Close()
 
 	c := gitea.NewClient(srv.URL, "tok")
-	result, err := c.DispatchWorkflow(context.Background(), "o", "r", "ci.yml", gitea.DispatchWorkflowArgs{
+	err := c.DispatchWorkflow(context.Background(), "o", "r", "ci.yml", gitea.DispatchWorkflowArgs{
 		Ref:    "main",
 		Inputs: map[string]any{"env": "prod"},
 	})
 	require.NoError(t, err)
-	assert.Equal(t, int64(789), result.RunID)
 
 	var body map[string]any
 	require.NoError(t, json.Unmarshal(gotBody, &body))
@@ -43,19 +45,6 @@ func TestDispatchWorkflow(t *testing.T) {
 	assert.Equal(t, "prod", inputs["env"])
 }
 
-func TestDispatchWorkflowMissingLocation(t *testing.T) {
-	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		// 204 but no Location header
-		w.WriteHeader(http.StatusNoContent)
-	}))
-	defer srv.Close()
-
-	c := gitea.NewClient(srv.URL, "tok")
-	_, err := c.DispatchWorkflow(context.Background(), "o", "r", "ci.yml", gitea.DispatchWorkflowArgs{Ref: "main"})
-	require.Error(t, err)
-	assert.Contains(t, err.Error(), "Location")
-}
-
 func TestDispatchWorkflowError404(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusNotFound)
@@ -63,7 +52,7 @@ func TestDispatchWorkflowError404(t *testing.T) {
 	defer srv.Close()
 
 	c := gitea.NewClient(srv.URL, "tok")
-	_, err := c.DispatchWorkflow(context.Background(), "o", "r", "ci.yml", gitea.DispatchWorkflowArgs{Ref: "main"})
+	err := c.DispatchWorkflow(context.Background(), "o", "r", "ci.yml", gitea.DispatchWorkflowArgs{Ref: "main"})
 	require.Error(t, err)
 	assert.True(t, errors.Is(err, gitea.ErrNotFound))
 }