feat(telegram): support copy text buttons

[kilhyeonjun]

Summary

• add Telegram COPY_BUTTON: label | text markers that render as Bot API CopyTextButton inline keyboard buttons
• support both normal sends and streaming final edits, while leaving markers visible when CopyTextButton is unavailable
• document the marker syntax and constraints for Telegram users

Test Plan

• uv run --extra messaging python -m pytest tests/gateway/test_telegram_copy_buttons.py tests/gateway/test_telegram_clarify_buttons.py tests/gateway/test_telegram_rich_messages.py tests/gateway/test_telegram_thread_fallback.py -q -o 'addopts='
• git diff --check
• uv run --extra messaging python -m py_compile plugins/platforms/telegram/adapter.py tests/gateway/test_telegram_copy_buttons.py

[alt-glitch]

This was generated by AI during triage.

Scope note for reviewers: the title/body describe a Telegram CopyTextButton feature, but the diff (+1147/-10 across 15 files) is dominated by an undisclosed OpenAI Codex quota-usage feature: new agent/credential_usage.py, new 455-line hermes_cli/codex_usage.py (hermes codex-usage CLI hitting the Codex quota endpoint), plus agent/codex_runtime.py/conversation_loop.py, gateway/run.py/slash_commands.py (_handle_usage_command), hermes_cli/main.py (cmd_insights/cmd_sessions), and hermes_state.py token counting. Only plugins/platforms/telegram/adapter.py + its test + the telegram doc match the title. Recommend splitting the Codex usage-tracking feature into its own PR (with a matching title) so it gets proper review, separate from the Telegram copy-button change.

[kilhyeonjun]

Closing this PR because unrelated Codex usage commits were accidentally included in the branch. Reopened a clean Telegram-only PR here: #59445