Warn (or default to `--events`) when `tt wait` runs without `--events`

[mostlydev]

Problem

Bare tt wait (no --events) wakes only on a turn change and silently misses messages and events. In mined Claude production-coordination sessions this was the #1 footgun — tt wait --events was used 0 times; agents hand-rolled tt events --wait polling loops instead.

Proposed fix

Either:

• (a) emit a next/warning when tt wait runs without --events: "bare wait wakes only on a turn change; use --events --after <cursor> to also receive messages and events", or
• (b) make --events the default for tt wait (with --after defaulting to the current tail).

Touch-points

• handleWaitCommand in src/cli/turn-commands.ts (~L42–85).

Context

Follow-up CT-G from the 0.8.0 instruction hardening; the skill now says "never bare tt wait". See docs/releases/0.8.0.md.