fix(gateway): include replied-to media attachments

[teknium1]

Summary

Replies to media-bearing Discord and Telegram messages now pass the referenced attachment into the gateway media pipeline so the agent can inspect it.

Changes

• Discord: merge message.reference.resolved.attachments with current/snapshot attachments before caching.
• Telegram: cache media from reply_to_message for text/command replies and attach the saved path to the event.
• Tests: add Discord and Telegram regressions for text replies to image-only messages.

Validation

Check	Result
RED regressions	Both failed before implementation
Targeted pytest	52 passed
py_compile	passed
Import smoke	imports ok TelegramAdapter DiscordAdapter

Infographic

[github-actions]

🔎 Lint report: hermes/hermes-fc97187c vs origin/main

ruff

Total: 0 on HEAD, 0 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 0 pre-existing issues carried over.

ty (type checker)

Total: 10908 on HEAD, 10908 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 5740 pre-existing issues carried over.

Diagnostics are surfaced as warnings — this check never fails the build.