feat(tools): issue_get, release_create, repo_delete (#11, #17, #20)

issue_get: GET /repos/{owner}/{repo}/issues/{number} — full issue with labels, assignees, comment count
release_create: POST /repos/{owner}/{repo}/releases — create release and tag in one call
repo_delete: DELETE /repos/{owner}/{repo} — confirm=<repo name> required, blocks accidents

internal/gitea/repos.go

@@ -52,6 +52,59 @@ func (c *Client) GetTree(ctx context.Context, owner, repo, ref string, recursive
 	return &t, nil
 }
 
+type Release struct {
+	ID         int64  `json:"id"`
+	TagName    string `json:"tag_name"`
+	Name       string `json:"name"`
+	Body       string `json:"body"`
+	Draft      bool   `json:"draft"`
+	Prerelease bool   `json:"prerelease"`
+	HTMLURL    string `json:"html_url"`
+	CreatedAt  string `json:"created_at"`
+}
+
+type CreateReleaseArgs struct {
+	TagName    string `json:"tag_name"`
+	Name       string `json:"name,omitempty"`
+	Body       string `json:"body,omitempty"`
+	Draft      bool   `json:"draft,omitempty"`
+	Prerelease bool   `json:"prerelease,omitempty"`
+	// Target branch or commit SHA for tag creation. Empty = repo default branch.
+	Target string `json:"target_commitish,omitempty"`
+}
+
+func (c *Client) CreateRelease(ctx context.Context, owner, repo string, args CreateReleaseArgs) (*Release, error) {
+	path := fmt.Sprintf("/api/v1/repos/%s/%s/releases", owner, repo)
+	body, err := json.Marshal(args)
+	if err != nil {
+		return nil, err
+	}
+	resp, status, err := c.PostJSON(ctx, path, body)
+	if err != nil {
+		return nil, err
+	}
+	if err := MapStatus(status, resp); err != nil {
+		return nil, err
+	}
+	var r Release
+	if err := json.Unmarshal(resp, &r); err != nil {
+		return nil, err
+	}
+	return &r, nil
+}
+
+func (c *Client) DeleteRepo(ctx context.Context, owner, repo string) error {
+	path := fmt.Sprintf("/api/v1/repos/%s/%s", owner, repo)
+	resp, status, err := c.DeleteJSON(ctx, path)
+	if err != nil {
+		return err
+	}
+	if status == 204 {
+		return nil
+	}
+	return MapStatus(status, resp)
+}
+
 func (c *Client) UpdateTopics(ctx context.Context, owner, repo string, topics []string) error {
 	path := fmt.Sprintf("/api/v1/repos/%s/%s/topics", owner, repo)
 	body, err := json.Marshal(map[string][]string{"topics": topics})