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/issues.go

@@ -7,11 +7,25 @@ import (
 )
 
 type Issue struct {
-	Number  int    `json:"number"`
-	Title   string `json:"title"`
-	Body    string `json:"body"`
-	HTMLURL string `json:"html_url"`
-	State   string `json:"state"`
+	Number    int      `json:"number"`
+	Title     string   `json:"title"`
+	Body      string   `json:"body"`
+	HTMLURL   string   `json:"html_url"`
+	State     string   `json:"state"`
+	CreatedAt string   `json:"created_at"`
+	UpdatedAt string   `json:"updated_at"`
+	Labels    []Label  `json:"labels"`
+	Assignees []User   `json:"assignees"`
+	Comments  int      `json:"comments"`
+}
+
+type Label struct {
+	ID   int64  `json:"id"`
+	Name string `json:"name"`
+}
+
+type User struct {
+	Login string `json:"login"`
 }
 
 type CreateIssueArgs struct {
@@ -22,6 +36,22 @@ type CreateIssueArgs struct {
 	Milestone int64    `json:"milestone,omitempty"`
 }
 
+func (c *Client) GetIssue(ctx context.Context, owner, repo string, number int) (*Issue, error) {
+	p := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d", owner, repo, number)
+	body, status, err := c.GetJSON(ctx, p)
+	if err != nil {
+		return nil, err
+	}
+	if err := MapStatus(status, body); err != nil {
+		return nil, err
+	}
+	var iss Issue
+	if err := json.Unmarshal(body, &iss); err != nil {
+		return nil, err
+	}
+	return &iss, nil
+}
+
 func (c *Client) CreateIssue(ctx context.Context, owner, repo string, args CreateIssueArgs) (*Issue, error) {
 	p := fmt.Sprintf("/api/v1/repos/%s/%s/issues", owner, repo)
 	payload, err := json.Marshal(args)