fix(telegram): #562 media-group uploads ignore chat_prefs-bound context

[Nathan Schram (nathanschram)]

Summary

Fixes #562 — media-group (2+ file) uploads failed with "no project context available for file upload" on single-project DM deployments (observed on the channelo VPS).

_handle_media_group computed ambient_context from only topic_store + _topics_chat_project, never consulting the per-chat ChatPrefsStore. The single-file path (loop.py:build_message_context) already has a topic-bound → chat_prefs chat-bound → default fallback ladder; the media-group path was missing the middle rung. With no default_project and no chat_map entry, media groups resolved ambient_context=None and failed.

Changes

• commands/media.py — _handle_media_group accepts chat_prefs and mirrors build_message_context's fallback ladder (with a # keep in sync comment).
• loop.py — MediaGroupBuffer._flush_media_group forwards self._chat_prefs to handle_media_group.
• tests/test_telegram_media_command.py — regression test asserting media-group uploads resolve the chat_prefs-bound project.

Testing

• uv run pytest tests/test_telegram_media_command.py tests/test_telegram_file_transfer_helpers.py — 58 passed
• uv run pytest tests/test_loop_coverage.py tests/test_telegram_bridge.py — 116 passed
• ruff check / ruff format --check — clean

Integration testing (media-group upload via @untether_dev_bot) to run as part of the next rc cycle per release-discipline.

🤖 Generated with Claude Code

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