feat: port remaining cohort scripts and make reusable

- Port 19 cohort scripts from /home/naomi/docs/cohort/
- Replace all hardcoded tokens and dotenv usage with os.environ
- Add pandas==3.0.1 dependency
- Add E501 to ruff ignore list for Discord message string content
- Make remove_resigned_members.py reusable (empty RESIGNED_IDS constant)
- Make update_roster_messages.py reusable (iterates all teams from JSON)
- Exclude 12 one-off/event-specific scripts as non-reusable

python/cohort/check_lengths.py

@@ -0,0 +1,75 @@
+"""Quick dry-run to check Discord message lengths before sending."""
+
+FIELDS = [
+    ("Discord Username", "Name", 18),
+    ("Discord Messages", "Msgs", 5),
+    ("PRs Opened", "PRs", 4),
+    ("Issues Opened", "Issues", 6),
+    ("Issue Comments", "Issue♟", 7),
+    ("PR Comments", "PR♟", 5),
+    ("PR Reviews", "Reviews", 7),
+    ("Commits", "Commits", 7),
+]
+
+REPORT_PATH = "catch_up_report.md"
+
+
+def parse_report(path: str) -> dict[str, list[dict]]:
+    """Parse the markdown table from catch_up_report.md into team → rows."""
+    teams: dict[str, list[dict]] = {}
+    with open(path, encoding="utf-8") as f:
+        lines = f.readlines()
+    header_line = None
+    for i, line in enumerate(lines):
+        if line.startswith("| Discord ID |"):
+            header_line = i
+            break
+    headers = [h.strip() for h in lines[header_line].strip().strip("|").split("|")]
+    for line in lines[header_line + 2 :]:
+        line = line.strip()
+        if not line.startswith("|"):
+            break
+        vals = [v.strip() for v in line.strip().strip("|").split("|")]
+        row = dict(zip(headers, vals))
+        teams.setdefault(row["Team"], []).append(row)
+    return teams
+
+
+def format_table(members: list[dict]) -> str:
+    """Format a team's member list as a monospace table for Discord."""
+    members = sorted(members, key=lambda r: int(r["Discord Messages"]), reverse=True)
+    col_widths = [w for _, _, w in FIELDS]
+    col_headers = [h for _, h, _ in FIELDS]
+    max_name = max(len(m["Discord Username"]) for m in members)
+    col_widths[0] = max(col_widths[0], max_name)
+
+    def pad(val: str, width: int, right_align: bool = False) -> str:
+        return val.rjust(width) if right_align else val.ljust(width)
+
+    header_row = "  ".join(
+        pad(col_headers[i], col_widths[i], right_align=(i > 0))
+        for i in range(len(FIELDS))
+    )
+    separator = "  ".join("-" * w for w in col_widths)
+    rows = []
+    for m in members:
+        vals = [m[key] for key, _, _ in FIELDS]
+        row = "  ".join(
+            pad(vals[i], col_widths[i], right_align=(i > 0)) for i in range(len(FIELDS))
+        )
+        rows.append(row)
+    return "\n".join([header_row, separator] + rows)
+
+
+def main() -> None:
+    """Check Discord message lengths for all teams."""
+    teams = parse_report(REPORT_PATH)
+    for team, members in teams.items():
+        table = format_table(members)
+        msg = f"**{team} — Activity Report (Feb 15–23)**\n```\n{table}\n```"
+        status = "OK" if len(msg) <= 2000 else f"OVER by {len(msg) - 2000}"
+        print(f"{team}: {len(msg)} chars — {status}")
+
+
+if __name__ == "__main__":
+    main()