feat: add plugin framework with UI contributions and suite selection

- Implemented PluginBlocks component to render various plugin UI elements.
- Created SuitePicker for selecting test suites and questions.
- Introduced usePluginUI hook for managing plugin UI state and manifest.
- Developed DocsPage for comprehensive plugin framework documentation.
- Added PluginPage to render pages declared by plugins based on the current path.

.core/prompts.py

@@ -1,46 +1,30 @@
-import re
-import textwrap
-from pathlib import Path
-from typing import Dict, List
+"""Prompt loading, kept as a thin façade over :mod:`suites`.
 
-from config import TESTS_DIR
+``tests/`` used to be a flat directory of ``test1.txt`` … ``testN.txt``. It is
+now a set of named suites — built-ins under ``.core/suites/`` and custom ones
+under ``tests/<slug>/`` — so every question carries a qualified ``<slug>/<file>``
+ID. Two suites containing ``test1.txt`` is normal, and nothing downstream may
+key off the bare filename.
+
+This module survives so ``runner.py`` and anything importing
+``load_test_prompts`` keep working; the logic lives in :mod:`suites`.
+"""
+
+from __future__ import annotations
+
+from typing import Dict, List, Optional, Sequence
+
+from suites import load_prompts
+
+__all__ = ["load_test_prompts"]
 
 
-def _natural_key(path: Path) -> List[object]:
-    parts = re.split(r"(\d+)", path.stem)
-    return [int(part) if part.isdigit() else part.lower() for part in parts]
+def load_test_prompts(slugs: Optional[Sequence[str]] = None) -> List[Dict[str, str]]:
+    """Questions to run.
 
-
-def load_test_prompts() -> List[Dict[str, str]]:
-    """Load prompt files from the tests directory."""
-    if not TESTS_DIR.exists():
-        return []
-
-    prompt_entries: List[Dict[str, str]] = []
-
-    for prompt_path in sorted(TESTS_DIR.glob("*.txt"), key=_natural_key):
-        try:
-            raw_text = prompt_path.read_text(encoding="utf-8")
-        except OSError:
-            continue
-
-        prompt_text = textwrap.dedent(raw_text).strip()
-        if not prompt_text:
-            continue
-
-        title = prompt_path.stem
-        for line in prompt_text.splitlines():
-            stripped_line = line.strip()
-            if stripped_line:
-                title = stripped_line
-                break
-
-        prompt_entries.append(
-            {
-                "title": title,
-                "prompt": prompt_text,
-                "filename": prompt_path.name,
-            }
-        )
-
-    return prompt_entries
+    With no argument this is **every built-in suite**, deliberately excluding
+    custom ones: a bare ``python auto-test.py`` should mean the same thing on
+    every machine rather than depending on local scratch suites. Pass explicit
+    slugs to include custom suites.
+    """
+    return load_prompts(slugs)