fix(discord): ignore thread recap system messages (#230)

[rudi193-cmd]

Summary

Fixes #230.

Discord emits system messages (e.g. type 18 thread-creation recap) on the parent channel when a thread is created. Those were routed through handleMessageCreate and could trigger spurious Claude prompts.

Only process regular messages (type 0) and replies (type 19). Bump plugin/marketplace version to 1.0.40 per contributor guidelines.

Note: #235 implements the same filter; this PR is rebased on current master from rudi193-cmd in case maintainers prefer a fresh branch. Happy to close in favor of #235 if that lands first.

Test plan

• Create a Discord thread in a listened channel — parent channel should not get a Claude prompt from the recap message
• Normal messages and replies in threads still work

Made with Cursor

[rudi193-cmd]

Note on the failing claude-review check: this is failing before review runs because the action has no Claude credential available in the repo:

ANTHROPIC_API_KEY:
Failed to authenticate. API Error: 401 Invalid authentication credentials.

The check shows as SUCCESS in the rollup because the workflow exits 0 on auth failure — but mergeStateStatus is UNSTABLE. This is a repo-side secret configuration issue, not a problem with the PR code. Happy to address any actual code feedback.

[TerrysPOV]

Reviewed — fix is clean. Enum + filter placement is correct (after bot-author check, before auth); no code concerns.

Heads-up: byte-identical to #235 (azaz44, draft) and the bumps to 1.0.40 are now stale since #233 landed master at 1.0.40 — version-guard will need 1.0.41 on rebase. Thanks for the parallel implementation @rudi193-cmd.