perf: defer posthog, sentry_sdk, and requests imports in telemetry

Move heavy third-party imports (posthog, sentry_sdk, and their
integrations) from module level into the functions that use them.
These imports cost ~350ms combined but are only needed when
telemetry is actually initialized, not on every CLI invocation.

- posthog_cf.py: defer `from posthog import Posthog` into
  initialize_posthog(), defer cfapi/console/lsp imports into ph()
- sentry.py: defer `import sentry_sdk` and integrations into
  init_sentry()

codeflash/telemetry/posthog_cf.py

@@ -1,16 +1,11 @@
 from __future__ import annotations
 
-import logging
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
-from posthog import Posthog
+if TYPE_CHECKING:
+    from posthog import Posthog
 
-from codeflash.api.cfapi import get_user_id
-from codeflash.cli_cmds.console import logger
-from codeflash.lsp.helpers import is_subagent_mode
-from codeflash.version import __version__
-
-_posthog = None
+_posthog: Posthog | None = None
 
 
 def initialize_posthog(*, enabled: bool = True) -> None:
@@ -21,6 +16,10 @@ def initialize_posthog(*, enabled: bool = True) -> None:
     if not enabled:
         return
 
+    import logging
+
+    from posthog import Posthog
+
     global _posthog
     _posthog = Posthog(project_api_key="phc_aUO790jHd7z1SXwsYCz8dRApxueplZlZWeDSpKc5hol", host="https://us.posthog.com")
     _posthog.log.setLevel(logging.CRITICAL)  # Suppress PostHog logging
@@ -36,6 +35,10 @@ def ph(event: str, properties: dict[str, Any] | None = None) -> None:
     if _posthog is None:
         return
 
+    from codeflash.api.cfapi import get_user_id
+    from codeflash.lsp.helpers import is_subagent_mode
+    from codeflash.version import __version__
+
     properties = properties or {}
     properties.update({"cli_version": __version__, "subagent": is_subagent_mode()})
 
@@ -44,4 +47,6 @@ def ph(event: str, properties: dict[str, Any] | None = None) -> None:
     if user_id:
         _posthog.capture(distinct_id=user_id, event=event, properties=properties)
     else:
+        from codeflash.cli_cmds.console import logger
+
         logger.debug("Failed to log event to PostHog: User ID could not be retrieved.")

codeflash/telemetry/sentry.py

@@ -1,24 +1,25 @@
-import logging
-
-import sentry_sdk
-from sentry_sdk.integrations.logging import LoggingIntegration
-from sentry_sdk.integrations.stdlib import StdlibIntegration
-
-
 def init_sentry(*, enabled: bool = False, exclude_errors: bool = False) -> None:
-    if enabled:
-        sentry_logging = LoggingIntegration(
-            level=logging.INFO,  # Capture info and above as breadcrumbs
-            event_level=logging.CRITICAL  # Send only fatal errors as events if exclude_errors is True
-            if exclude_errors
-            else logging.ERROR,  # Otherwise, error logs will create sentry events
-        )
+    if not enabled:
+        return
 
-        sentry_sdk.init(
-            dsn="https://4b9a1902f9361b48c04376df6483bc96@o4506833230561280.ingest.sentry.io/4506833262477312",
-            integrations=[sentry_logging],
-            disabled_integrations=[StdlibIntegration],
-            traces_sample_rate=0,
-            profiles_sample_rate=0,
-            ignore_errors=[KeyboardInterrupt],
-        )
+    import logging
+
+    import sentry_sdk
+    from sentry_sdk.integrations.logging import LoggingIntegration
+    from sentry_sdk.integrations.stdlib import StdlibIntegration
+
+    sentry_logging = LoggingIntegration(
+        level=logging.INFO,  # Capture info and above as breadcrumbs
+        event_level=logging.CRITICAL  # Send only fatal errors as events if exclude_errors is True
+        if exclude_errors
+        else logging.ERROR,  # Otherwise, error logs will create sentry events
+    )
+
+    sentry_sdk.init(
+        dsn="https://4b9a1902f9361b48c04376df6483bc96@o4506833230561280.ingest.sentry.io/4506833262477312",
+        integrations=[sentry_logging],
+        disabled_integrations=[StdlibIntegration],
+        traces_sample_rate=0,
+        profiles_sample_rate=0,
+        ignore_errors=[KeyboardInterrupt],
+    )