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>

src/providers/base.py

@@ -11,6 +11,21 @@ import requests
 
 from src.utils import redact_secrets
 
+# curl_cffi has its own exception hierarchy (rooted at CurlError → OSError),
+# completely separate from requests.exceptions. Import them so _make_request
+# can catch both when a curl_cffi session is in use.
+try:
+    from curl_cffi.requests.exceptions import (
+        HTTPError as _CurlHTTPError,
+        ConnectionError as _CurlConnectionError,
+        Timeout as _CurlTimeout,
+    )
+except ImportError:
+    # Fall back to requests types — catching them twice is harmless.
+    _CurlHTTPError = requests.HTTPError  # type: ignore[misc,assignment]
+    _CurlConnectionError = requests.ConnectionError  # type: ignore[misc,assignment]
+    _CurlTimeout = requests.Timeout  # type: ignore[misc,assignment]
+
 logger = logging.getLogger(__name__)
 
 # Request timeouts (connect, read) in seconds
@@ -271,7 +286,7 @@ class BaseProvider(ABC):
             except ProviderError:
                 raise
 
-            except (requests.ConnectionError, requests.Timeout) as e:
+            except (requests.ConnectionError, requests.Timeout, _CurlConnectionError, _CurlTimeout) as e:
                 last_exc = e
                 if attempt > MAX_RETRIES:
                     raise ProviderError(
@@ -293,7 +308,7 @@ class BaseProvider(ABC):
                 )
                 time.sleep(wait)
 
-            except requests.HTTPError as e:
+            except (requests.HTTPError, _CurlHTTPError) as e:
                 raise ProviderError(
                     self.provider_name, f"{method} {url}", e
                 ) from e