add /export_denicky slash command to export threads from deníčky channel

[benabraham]

Summary

Add /export_denicky slash command to export threads from the "deníčky" channel (ID: 1075087192101244928) to JSON format

Export includes all messages chronologically (oldest to newest) with usernames, not just IDs

Permission checks: only bot owner, moderators (manage_messages permission), or the thread author can export
Response is ephemeral (only visible to the user invoking the command)

Implementation

New files

• src/jg/chick/lib/thread_export.py - Library module with export logic and permission checks
• tests/test_lib_thread_export.py - 22 unit tests covering export functionality and permissions

Modified files

• src/jg/chick/bot.py - Added the new slash command

JSON output format

{
  "id": 123456789,
  "name": "Thread name",
  "created_at": "2024-01-15T09:00:00+00:00",
  "messages": [
    {
      "id": 1,
      "author_id": 100,
      "author_name": "Username",
      "content": "Message text",
      "created_at": "2024-01-15T10:00:00+00:00"
    }
  ]
}

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a new module jg.chick.lib.thread_export implementing ExportedMessage and ExportedThread dataclasses, a DENICKY_CHANNEL_ID constant, and functions is_in_denicky_channel, can_export_thread, export_message, export_thread_messages, and export_thread to serialize threads and messages to JSON. Adds a slash command export_denicky in src/jg/chick/bot.py that validates thread context, checks permissions, exports the thread, and returns the JSON as an ephemeral file. Adds tests/test_lib_thread_export.py with extensive unit tests for channel checks, permission logic, serialization, and async export behavior.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding a new /export_denicky slash command for exporting threads from the deníčky channel.
Description check	✅ Passed	The description is well-structured and directly related to the changeset, providing implementation details, permission logic, and JSON output format.

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