feat(tlon): align group and channel read model

[wca4a]

Stacked on #3. Split from NousResearch#26300.

Scope:

• Align Tlon group/channel read behavior with OpenClaw paths: channels firehose, chat DMs, groups-ui membership updates, foreign group invites, auto-discovery refresh, DM polling fallback, owner listen, alias mentions, and channel authorization.
• Add tests for delayed blobs, thread blobs, group mentions, owner listen, invite approval, groups-ui/foreigns handling, and event routing.

Validation:

• scripts/run_tests.sh tests/gateway/test_tlon_adapter.py tests/tools/test_tlon_tool.py

Result: 41 passed.

[wca4a]

Fixed the thread-reply mention path.

What changed:

• Channel thread replies now read the OpenClaw/Tlon %channels r-reply.set.reply-essay shape.
• Kept memo/essay fallbacks for older or simplified fixtures.
• Added regression coverage for a thread reply mention routing to handle_message with the parent thread id.

Validation:

• scripts/run_tests.sh tests/gateway/test_tlon_adapter.py
• top branch focused suite: 222 passed