fix(gateway): suppress the duplicate clarify tool-progress bubble (#69175)

[PRATHAMESH75]

Summary

When tool progress is enabled, a clarify call renders two near-identical messages in chat:

1. The generic tool-progress bubble — ❓ Asking <question> — built from get_tool_verb("clarify") → "Asking" in progress_callback.
2. The full clarify prompt sent by the tool's own callback (send_clarify, scheduled from _clarify_callback_sync in gateway/run.py).

The bubble is a verbatim duplicate of the prompt, so the user sees the same clarify question twice (#69175).

Fix

clarify already owns its chat rendering via the adapter's send_clarify callback, so its generic progress bubble is always redundant. This PR:

• adds agent.display.tool_renders_own_progress() — a small predicate mirroring the existing verb_drops_preview() idiom — backed by a _TOOL_SELF_RENDERED_PROGRESS frozenset marking tools that deliver their own complete prompt via a dedicated adapter callback;
• gates progress_callback in gateway/run.py on it, right after the tool.started filter, so the duplicate bubble is skipped.

Scope is deliberately narrow:

• the ephemeral live status line (Slack setStatus) and log-mode stdout logging are unaffected — they run before this gate;
• the clarify verb mapping ("Asking") is left intact, so nothing else that reads the verb changes.

Tests

• tests/agent/test_display.py::TestToolRendersOwnProgress — the predicate is True for clarify, False for regular tools, and the verb mapping stays defined.
• Ran tests/agent/test_display.py plus the gateway clarify suites (test_clarify_active_session_bypass, test_telegram_clarify_buttons, test_discord_clarify_buttons) — 106 passed, no regressions.

Fixes #69175

[alt-glitch]

This was generated by AI during triage.

Related: #54328 already includes the clarify progress-bubble suppression alongside a separate prose-before-poll ordering repair. This is a focused alternative; maintainers can choose the preferred scope.

[teknium1]

Thanks for the sharp diagnosis @PRATHAMESH75 — you found the exact root cause (the generic tool-progress bubble duplicating send_clarify's own rendering) independently, same day it was fixed.

This landed hours earlier via #69318 (merged): the gateway now skips the tool-progress bubble for clarify entirely, since the prompt rendering IS the progress. Closing as superseded.

Appreciate both your Slack PRs today — the block-text one (#68160) was also superseded only because a broader consolidated fix covered it. Keep them coming.