Nine surfaces (feishu, teams, slack, telegram, whatsapp_cloud, qqbot, matrix, discord, relay)
each re-derived the approval choice set — [Allow Once]; session + always unless smart-denied;
[Deny] — and four of them (discord, slack, teams, whatsapp_cloud) never adopted
base._format_exec_approval, so header/reason/smart-deny wording and truncation budgets drifted
per adapter. Three separate commits had to touch 5–9 adapters for one semantic fix.
BasePlatformAdapter.send_exec_approval now builds an ExecApprovalPrompt (shared text via
_format_exec_approval, shared `(label, choice, style)` rows via _exec_approval_actions) and
hands it to the `_send_exec_approval_prompt` hook. Each adapter keeps only its widget mapping
(~10–20 LOC); platform wording stays via the existing `_EA_*` class attrs, and a new
`_exec_approval_cmd_budget` hook lets Slack/Discord budget the command against their hard
message caps (3000-char section / 2000-char message) instead of computing it inline.
`_EA_REASON_BUDGET` covers Slack's 500 / Discord's 300 reason caps.
The runner used to detect button support by `hasattr(type(adapter), "send_exec_approval")`;
that is now true for every adapter, so `_renders_exec_approval_buttons` asks
`supports_exec_approval_buttons()` (hook overridden?) and keeps the duck-typed check for
non-BasePlatformAdapter classes.
Visible text changes (button semantics unchanged everywhere):
- Discord: the smart-deny line now follows the reason (was inside the header before the
fence); the truncation marker is "..." not "\n... [truncated]".
- Slack: smart-deny line follows the reason instead of the header.
- Teams: unchanged (same 2000-char preview, same smart-deny block).
- WhatsApp Cloud: identical text; body still capped at 1024.
- QQBot/relay: unchanged.
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