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/tools/repo_delete.go

@@ -0,0 +1,59 @@
+package tools
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/registry"
+)
+
+type RepoDelete struct {
+	c *gitea.Client
+	a *allowlist.Allowlist
+}
+
+func NewRepoDelete(c *gitea.Client, a *allowlist.Allowlist) *RepoDelete {
+	return &RepoDelete{c: c, a: a}
+}
+
+func (t *RepoDelete) Descriptor() registry.ToolDescriptor {
+	return registry.ToolDescriptor{
+		Name:        "repo_delete",
+		Description: "Permanently delete a repository. Requires confirm=<repo name> to prevent accidents.",
+		InputSchema: json.RawMessage(`{
+			"type":"object",
+			"properties":{
+				"owner":{"type":"string"},
+				"name":{"type":"string"},
+				"confirm":{"type":"string","description":"Must equal the repo name exactly to proceed."}
+			},
+			"required":["owner","name","confirm"]
+		}`),
+	}
+}
+
+type repoDeleteArgs struct {
+	Owner   string `json:"owner"`
+	Name    string `json:"name"`
+	Confirm string `json:"confirm"`
+}
+
+func (t *RepoDelete) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
+	var args repoDeleteArgs
+	if err := parseArgs(raw, &args); err != nil {
+		return nil, err
+	}
+	if err := t.a.Check(args.Owner); err != nil {
+		return nil, err
+	}
+	if args.Confirm != args.Name {
+		return nil, fmt.Errorf("repo_delete requires confirm=%q to match the repo name — got %q", args.Name, args.Confirm)
+	}
+	if err := t.c.DeleteRepo(ctx, args.Owner, args.Name); err != nil {
+		return nil, err
+	}
+	return textOK(map[string]string{"status": "deleted", "repo": args.Owner + "/" + args.Name})
+}