fix: POST for file creation (Gitea 1.25+), add edit_issue tool, persist poll state

- files.ts: Use POST for new files, PUT for updates (Gitea 1.25 requires this)
- issues.ts: Add editIssue() for state/title/body changes
- write-tools.ts: Add gitea_edit_issue tool (open/close/edit issues)
- webhook/server.ts: Persist lastPollAt to disk to prevent duplicate
  events on reload; use followUp delivery to queue events during LLM turns
- index.ts: Use deliverAs:'followUp' for sendUserMessage

src/files.ts

@@ -44,12 +44,36 @@ export async function updateFile(
 	filepath: string,
 	opts: { content: string; message: string; branch?: string; sha?: string },
 ): Promise<FileCommitResponse> {
-	return client.put<FileCommitResponse>(`/repos/${owner}/${repo}/contents/${filepath}`, {
+	const body = {
 		content: Buffer.from(opts.content).toString("base64"),
 		message: opts.message,
 		branch: opts.branch,
-		sha: opts.sha,
-	});
+	};
+
+	if (opts.sha) {
+		// Explicit SHA → update existing file (PUT)
+		return client.put<FileCommitResponse>(`/repos/${owner}/${repo}/contents/${filepath}`, {
+			...body,
+			sha: opts.sha,
+		});
+	}
+
+	// No SHA → try POST (create). If 422 "SHA Required", the file already
+	// exists — fetch its SHA and retry with PUT.
+	try {
+		return await client.post<FileCommitResponse>(`/repos/${owner}/${repo}/contents/${filepath}`, body);
+	} catch (err: any) {
+		if (err?.status === 422 && /sha/i.test(err?.body ?? "")) {
+			const existing = await getFileContent(client, owner, repo, filepath, {
+				ref: opts.branch,
+			});
+			return client.put<FileCommitResponse>(`/repos/${owner}/${repo}/contents/${filepath}`, {
+				...body,
+				sha: existing.sha,
+			});
+		}
+		throw err;
+	}
 }
 
 /** Delete a file in a repo */

src/issues.ts

@@ -76,3 +76,14 @@ export async function createIssue(
 		labels: opts.labels ?? [],
 	});
 }
+
+/** Edit an existing issue (title, body, state) */
+export async function editIssue(
+	client: GiteaClient,
+	owner: string,
+	repo: string,
+	index: number,
+	opts: { title?: string; body?: string; state?: "open" | "closed" },
+): Promise<Issue> {
+	return client.patch<Issue>(`/repos/${owner}/${repo}/issues/${index}`, opts);
+}