* fix: respect disabled auto-compaction on context overflow
Port from anomalyco/opencode#30749.
When compression.enabled is false, NO automatic compaction trigger may
fire. The proactive token-threshold paths (preflight + post-response
should_compress gate) already honoured the setting, but the three
provider-overflow recovery paths in the agent loop — long-context-tier
429, 413 payload-too-large, and context-overflow — called
_compress_context() unconditionally, silently compressing and rotating
the session against the user's explicit choice.
Add a single guard at the top of the overflow-recovery dispatch: when
compression is disabled and the error is one of those three overflow
classes, surface a terminal error (compaction_disabled: True) telling the
user to /compress manually, /new, switch to a larger-context model, or
reduce attachments. Manual /compress (force=True) is unaffected — it never
enters this loop.
Tests: new TestOverflowWithCompactionDisabled (413 + 400 overflow don't
compress when disabled; control case still compresses when enabled).
Existing overflow-recovery tests updated to enable compaction explicitly
(they verify the recovery fires); fixture defaults flipped to True to
match production (compression.enabled defaults to True).
* fix(gateway): plain text while busy interrupts by default again
busy_input_mode (default 'interrupt') was advertised as the busy-behavior
knob, but a second knob added in 7abd62719 — busy_text_mode, defaulting to
'queue' — short-circuited every plain TEXT message before busy_input_mode
was consulted. Result: plain follow-ups silently queued instead of
interrupting, even with busy_input_mode left at its 'interrupt' default
(regression #38390, silent-queue #31588).
Collapse to one source of truth: busy_input_mode drives text handling.
busy_text_mode is kept only as a legacy explicit override for back-compat
(existing queue setups keep working); when unset it follows busy_input_mode.
All default fallbacks flipped queue->interrupt. The debounce mechanism is
preserved and now keyed off the resolved mode.
Fixes#38390, #31588.
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