chore: script to generate bash focus PRs (#5520)

Run

`uv run scripts/generate_bash_focus.py <since-tag>`

to print a list of all PRs labeled with `bash-focus`.

Example output:

```
Using latest tag: 0.14.9
Fetching PRs with label 'bash-focus' since 0.14.9...

Found 4 PR(s) with label 'bash-focus':

#5515: fix: reuse ports that are available but recently closed
  Author: @akshayka
  Link: #5515
  Merged: 2025-07-02T15:52:50Z

#5507: fix: include all query params in WebSocket connection
  Author: @harterrt-shopify
  Link: #5507
  Merged: 2025-07-01T17:41:15Z

#5491: Ensure cell action tooltip appears above sidebar panel
  Author: @manzt
  Link: #5491
  Merged: 2025-06-30T18:09:19Z

#5474: register UIElement on change if it is missing from the UIElementRegistry
  Author: @buckley-w-david
  Link: #5474
  Merged: 2025-06-30T15:56:00Z
  ```

---------

Co-authored-by: Trevor Manz <trevor.j.manz@gmail.com>

Author: akshayka

scripts/generate_bash_focus.py

@@ -0,0 +1,157 @@
+# /// script
+# requires-python = ">=3.13,<3.14"
+# dependencies = [
+#     "msgspec",
+# ]
+#
+# [tool.uv]
+# exclude-newer = "2025-06-27T12:38:25.742953-04:00"
+# ///
+"""Get GitHub PRs labeled with 'bash-focus' since the last release."""
+
+from __future__ import annotations
+
+import re
+import subprocess
+import sys
+
+import msgspec
+
+
+class Author(msgspec.Struct):
+    """GitHub author/user information."""
+
+    login: str
+
+
+class Label(msgspec.Struct):
+    """GitHub label information."""
+
+    name: str
+    color: str | None = None
+    description: str | None = None
+
+
+class PullRequest(msgspec.Struct):
+    """GitHub Pull Request information."""
+
+    number: int
+    title: str
+    author: Author
+    labels: list[Label]
+    url: str
+    mergedAt: str | None = None
+
+
+def get_latest_tag() -> str:
+    """Get the latest git tag."""
+    result = subprocess.run(
+        ["git", "describe", "--tags", "--abbrev=0"],
+        capture_output=True,
+        text=True,
+        check=True,
+    )
+    return result.stdout.strip()
+
+
+def get_commits_since_tag(since_tag: str) -> set[int]:
+    """Get PR numbers from commits since a specific tag."""
+    try:
+        result = subprocess.run(
+            [
+                "git",
+                "log",
+                f"{since_tag}..HEAD",
+                "--format=%s",
+                "--first-parent",
+                "main",
+            ],
+            capture_output=True,
+            text=True,
+            check=True,
+        )
+    except subprocess.CalledProcessError:
+        print(f"Error: Tag '{since_tag}' not found. Available tags:")
+        tag_result = subprocess.run(
+            ["git", "tag", "--list", "--sort=-version:refname"],
+            capture_output=True,
+            text=True,
+        )
+        for tag in tag_result.stdout.strip().split('\n')[:10]:
+            print(f"  {tag}")
+        sys.exit(1)
+    
+    pr_numbers = set()
+    for line in result.stdout.strip().split('\n'):
+        if not line:
+            continue
+        # Extract PR number from commit message
+        pr_match = re.search(r'#(\d+)', line)
+        if pr_match:
+            pr_numbers.add(int(pr_match.group(1)))
+    
+    return pr_numbers
+
+
+def get_prs_with_label(label: str, pr_numbers: set[int]) -> list[PullRequest]:
+    """Get PRs with specific label from a set of PR numbers."""
+    result = subprocess.run(
+        [
+            "gh",
+            "pr",
+            "list",
+            "--base",
+            "main",
+            "--state",
+            "merged",
+            "--label",
+            label,
+            "--limit",
+            "100",
+            "--json",
+            "number,title,author,labels,url,mergedAt",
+        ],
+        check=True,
+        capture_output=True,
+        text=True,
+    )
+    
+    all_prs = msgspec.json.decode(result.stdout, type=list[PullRequest])
+    
+    # Filter PRs that are in our commit list
+    filtered_prs = [pr for pr in all_prs if pr.number in pr_numbers]
+    
+    return filtered_prs
+
+
+def main() -> None:
+    label = "bash-focus"
+    
+    # Allow specifying a tag or use the latest one
+    if len(sys.argv) >= 2:
+        since_tag = sys.argv[1]
+    else:
+        since_tag = get_latest_tag()
+        print(f"Using latest tag: {since_tag}")
+    
+    print(f"Fetching PRs with label '{label}' since {since_tag}...\n")
+    
+    pr_numbers = get_commits_since_tag(since_tag)
+    prs = get_prs_with_label(label, pr_numbers)
+    
+    if not prs:
+        print(f"No PRs found with label '{label}' since {since_tag}")
+        return
+    
+    print(f"Found {len(prs)} PR(s) with label '{label}':\n")
+    
+    for pr in prs:
+        print(f"#{pr.number}: {pr.title}")
+        print(f"  Author: @{pr.author.login}")
+        print(f"  Link: {pr.url}")
+        print(f"  Merged: {pr.mergedAt}")
+        print()
+
+
+if __name__ == "__main__":
+    main()