Include labels in formatContext() output for issues and PRs (#1298)

The formatted_context block sent to the agent omitted labels for both
issues and pull requests, even though the GraphQL queries already
fetched them. This caused agents to incorrectly report "no labels"
when labels existed, breaking any workflow that routes on label state
(e.g., drift-fix routing on drift:* labels in a Drift Watcher pattern).

Changes:
- Add 'PR Labels:' line to PR context output
- Add 'Issue Labels:' line to issue context output
- Both emit 'none' when no labels are present (explicit > omitted)
- Bump labels(first: 1) → labels(first: 100) in both queries; the
  previous cap meant only one label would appear even after the
  formatter fix
- Update existing tests + add 'with labels' tests for both PR and
  issue branches

Discovered while building a GitHub Actions workflow that uses this
action for drift-watcher routing in an internal seed framework
(joshpayne-joby/slim-routines#6). The agent self-diagnosed the gap
by inspecting this action's source — a satisfying full-loop.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

src/github/api/queries/github.ts

@@ -25,7 +25,7 @@ export const PR_QUERY = `
         additions
         deletions
         state
-        labels(first: 1) {
+        labels(first: 100) {
           nodes {
             name
           }
@@ -113,7 +113,7 @@ export const ISSUE_QUERY = `
         updatedAt
         lastEditedAt
         state
-        labels(first: 1) {
+        labels(first: 100) {
           nodes {
             name
           }

src/github/data/formatter.ts

@@ -8,6 +8,11 @@ import type {
 import type { GitHubFileWithSHA } from "./fetcher";
 import { sanitizeContent } from "../utils/sanitizer";
 
+function formatLabels(labelNodes: Array<{ name: string }>): string {
+  if (labelNodes.length === 0) return "none";
+  return labelNodes.map((l) => l.name).join(", ");
+}
+
 export function formatContext(
   contextData: GitHubPullRequest | GitHubIssue,
   isPR: boolean,
@@ -19,6 +24,7 @@ export function formatContext(
 PR Author: ${prData.author.login}
 PR Branch: ${prData.headRefName} -> ${prData.baseRefName}
 PR State: ${prData.state}
+PR Labels: ${formatLabels(prData.labels.nodes)}
 PR Additions: ${prData.additions}
 PR Deletions: ${prData.deletions}
 Total Commits: ${prData.commits.totalCount}
@@ -28,7 +34,8 @@ Changed Files: ${prData.files.nodes.length} files`;
     const sanitizedTitle = sanitizeContent(issueData.title);
     return `Issue Title: ${sanitizedTitle}
 Issue Author: ${issueData.author.login}
-Issue State: ${issueData.state}`;
+Issue State: ${issueData.state}
+Issue Labels: ${formatLabels(issueData.labels.nodes)}`;
   }
 }
 

test/data-formatter.test.ts

@@ -54,6 +54,53 @@ describe("formatContext", () => {
 PR Author: test-user
 PR Branch: feature/test -> main
 PR State: OPEN
+PR Labels: none
+PR Additions: 50
+PR Deletions: 30
+Total Commits: 3
+Changed Files: 2 files`,
+    );
+  });
+
+  test("formats PR context with labels", () => {
+    const prData: GitHubPullRequest = {
+      title: "Test PR",
+      body: "PR body",
+      author: { login: "test-user" },
+      baseRefName: "main",
+      headRefName: "feature/test",
+      headRefOid: "abc123",
+      isCrossRepository: false,
+      headRepository: { owner: { login: "testowner" }, name: "testrepo" },
+      createdAt: "2023-01-01T00:00:00Z",
+      additions: 50,
+      deletions: 30,
+      state: "OPEN",
+      labels: {
+        nodes: [{ name: "bug" }, { name: "enhancement" }],
+      },
+      commits: {
+        totalCount: 3,
+        nodes: [],
+      },
+      files: {
+        nodes: [{} as GitHubFile, {} as GitHubFile],
+      },
+      comments: {
+        nodes: [],
+      },
+      reviews: {
+        nodes: [],
+      },
+    };
+
+    const result = formatContext(prData, true);
+    expect(result).toBe(
+      `PR Title: Test PR
+PR Author: test-user
+PR Branch: feature/test -> main
+PR State: OPEN
+PR Labels: bug, enhancement
 PR Additions: 50
 PR Deletions: 30
 Total Commits: 3
@@ -80,7 +127,36 @@ Changed Files: 2 files`,
     expect(result).toBe(
       `Issue Title: Test Issue
 Issue Author: test-user
-Issue State: OPEN`,
+Issue State: OPEN
+Issue Labels: none`,
+    );
+  });
+
+  test("formats Issue context with labels", () => {
+    const issueData: GitHubIssue = {
+      title: "Test Issue",
+      body: "Issue body",
+      author: { login: "test-user" },
+      createdAt: "2023-01-01T00:00:00Z",
+      state: "OPEN",
+      labels: {
+        nodes: [
+          { name: "architecture" },
+          { name: "agent-sdk" },
+          { name: "drift:functional" },
+        ],
+      },
+      comments: {
+        nodes: [],
+      },
+    };
+
+    const result = formatContext(issueData, false);
+    expect(result).toBe(
+      `Issue Title: Test Issue
+Issue Author: test-user
+Issue State: OPEN
+Issue Labels: architecture, agent-sdk, drift:functional`,
     );
   });
 });