fix(oocana): add warnings.warn for deprecated APIs

[leavesster]

Summary

• Add warnings.warn() with DeprecationWarning for deprecated APIs
• Affected methods: pkg_dir property, send_error() method

Problem

Deprecated APIs had docstring comments but no runtime warnings:

@property
def pkg_dir(self) -> str:
    """Deprecated, use pkg_data_dir instead."""
    return self.__pkg_data_dir

Users wouldn't know they're using deprecated APIs until reading docs.

Solution

Add proper deprecation warnings:

import warnings

@property
def pkg_dir(self) -> str:
    """Deprecated, use pkg_data_dir instead."""
    warnings.warn(
        "pkg_dir is deprecated, use pkg_data_dir instead",
        DeprecationWarning,
        stacklevel=2
    )
    return self.__pkg_data_dir

Test Plan

• All existing tests pass
• Using deprecated APIs now triggers visible warnings

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[Copilot]

Pull request overview

This PR adds runtime deprecation warnings using Python's warnings.warn() for two deprecated APIs in the Context class that previously only had docstring notices. This ensures users are actively notified when using deprecated functionality.

Changes:

• Added warnings module import
• Added warnings.warn() calls with DeprecationWarning for pkg_dir property and send_error() method
• Updated docstrings to use proper Sphinx deprecation directive format

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