Review findings (Salt, adversarial pass on the two preceding commits):
- BLOCKING: a `tool_progress: null` (global, platform, or legacy overrides)
counted as an explicit mode because the gate tested key presence, while
the display resolver skips None and inherits. Null resolved to Slack's
tier default `off` and disabled cards, which is the default-off trap the
change exists to avoid. Explicit intent is now a non-None value (or the
env bridge). Tests cover null at each level plus null-over-global-all;
mutation to key-presence turns the three null cases red.
- TASTE: `_TaskCardState.egress_declined` now also latched on unsupported
destinations, so the name no longer described the field. Renamed to
`publication_suppressed` with both causes documented; readers unchanged.
- SHOULD-FIX: slack.md still promised an unconditional text fallback and
described the opt-in as independent of tool_progress. Rewritten: cards
follow an operator-written off (including /verbose), null inherits, an
un-threaded chat with the card lane active shows no tool progress, other
native failures keep the editable fallback.
Victor Kyriazakos
bc125d59d5