feat: v0.2.0 — Joplin import, ChatGPT Projects, --project filter

Core features:
- Add `joplin` command: syncs exported Markdown to Joplin via local REST API
- Notebooks auto-created per provider+project (e.g. "ChatGPT - My Project")
- Idempotent: notes updated (not duplicated) on re-run; note ID tracked in manifest
- Add `--project` filter to `export` and `list` commands (substring or 'none')
- Add ChatGPT Projects support via CHATGPT_PROJECT_IDS env var

Config:
- Add JOPLIN_API_TOKEN, JOPLIN_API_URL, JOPLIN_REQUEST_TIMEOUT
- Version now read from importlib.metadata (single source of truth: pyproject.toml)
- Bump version to 0.2.0

Quality:
- Explicit Timeout handling in JoplinClient with actionable error messages
- token validation (validate_token) separate from connectivity (ping)
- Remove debug_auth.py, debug_claude.py, and untracked .har file
- Add *.har to .gitignore (may contain auth cookies/session tokens)
- Update README, CHANGELOG, FUTURE.md to reflect v0.2.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_providers.py

@@ -13,15 +13,17 @@ class TestChatGPTNormalization:
 
     def _get_provider(self):
         from src.providers.chatgpt import ChatGPTProvider
-        import unittest.mock as mock
         # Bypass __init__ token check
         p = ChatGPTProvider.__new__(ChatGPTProvider)
         import requests
         p._session = requests.Session()
         p._org_id = None
+        p._project_ids = []
+        p._project_map = {}
+        p._project_name_cache = {}
         return p
 
-    def test_normalizes_with_project(self):
+    def test_normalizes_conversation(self):
         raw = json.loads((FIXTURES / "chatgpt_conversation.json").read_text())
         p = self._get_provider()
         result = p.normalize_conversation(raw)
@@ -29,7 +31,8 @@ class TestChatGPTNormalization:
         assert result["id"] == "chatgpt-conv-001"
         assert result["title"] == "Python Async Tutorial"
         assert result["provider"] == "chatgpt"
-        assert result["project"] == "Learning Python"
+        # No entry in _project_map → project is None
+        assert result["project"] is None
         assert result["created_at"] != ""
         assert result["updated_at"] != ""
         assert isinstance(result["messages"], list)
@@ -42,6 +45,15 @@ class TestChatGPTNormalization:
         assert result["project"] is None
         assert result["id"] == "chatgpt-conv-002"
 
+    def test_normalizes_with_project_from_map(self):
+        """Project name from _project_map (populated by fetch_all_conversations) flows through."""
+        raw = json.loads((FIXTURES / "chatgpt_conversation.json").read_text())
+        p = self._get_provider()
+        p._project_map["chatgpt-conv-001"] = "My Research Project"
+        result = p.normalize_conversation(raw)
+
+        assert result["project"] == "My Research Project"
+
     def test_extracts_text_messages(self):
         raw = json.loads((FIXTURES / "chatgpt_conversation.json").read_text())
         p = self._get_provider()