feat: weekly progress update system for TurboQuant (#76)

- scripts/weekly_update.py: Auto-generates weekly update from git log,
  Gitea API (issues/PRs/blockers), and benchmark results. Supports
  --post to issue #76, --json for raw data, --since for date range.
- scripts/weekly_update.sh: Shell wrapper for convenience.
- docs/WEEKLY_TEMPLATE.md: Manual update template.
- docs/PROJECT_STATUS.md: Added Weekly Progress Updates section with
  process (weekly cadence, benchmark-as-happens, blocker escalation).
- tests/test_weekly_update.py: Validates script runs, JSON output,
  and handles edge cases.

tests/test_weekly_update.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+"""Quick test for weekly_update.py — verifies parsing, output format, and edge cases."""
+
+import subprocess
+import sys
+import json
+from pathlib import Path
+
+SCRIPT = Path(__file__).resolve().parent.parent / "scripts" / "weekly_update.py"
+
+def run(args: list[str]) -> str:
+    result = subprocess.run(
+        [sys.executable, str(SCRIPT)] + args,
+        capture_output=True, text=True, cwd=str(SCRIPT.parent.parent)
+    )
+    return result.stdout, result.stderr, result.returncode
+
+def test_basic_output():
+    """Script runs without error and produces markdown."""
+    stdout, stderr, rc = run(["--since", "2026-01-01"])
+    assert rc == 0, f"Exit code {rc}: {stderr}"
+    assert "## Week of" in stdout, f"Missing header: {stdout[:200]}"
+    assert "### Completed" in stdout, f"Missing Completed section: {stdout[:200]}"
+    assert "### Next Week" in stdout, f"Missing Next Week section: {stdout[-200:]}"
+    print("PASS: basic_output")
+
+def test_json_output():
+    """Script outputs valid JSON in --json mode."""
+    stdout, stderr, rc = run(["--json", "--since", "2026-01-01"])
+    assert rc == 0, f"Exit code {rc}: {stderr}"
+    data = json.loads(stdout)
+    assert "commits" in data
+    assert "since" in data
+    print(f"PASS: json_output ({len(data['commits'])} commits)")
+
+def test_no_crash_future_date():
+    """Script handles future date gracefully."""
+    stdout, stderr, rc = run(["--since", "2030-01-01"])
+    assert rc == 0, f"Exit code {rc}: {stderr}"
+    print("PASS: future_date_no_crash")
+
+def test_empty_range():
+    """Script handles a very old date with no commits."""
+    stdout, stderr, rc = run(["--since", "2020-01-01", "--since", "2020-01-02"])
+    assert rc == 0
+    print("PASS: empty_range")
+
+if __name__ == "__main__":
+    test_basic_output()
+    test_json_output()
+    test_no_crash_future_date()
+    print("\nAll tests passed.")