Stop empty assistant turns from spinning Loop forever

[ByBrawe]

Problem

A real OpenCode session repeatedly completed assistant turns with no visible text or tool activity. The Loop treated each completed timestamp as a successful iteration, immediately injected the next autonomous continuation, and could churn indefinitely.

Fix

• Distinguish a merely completed assistant message from a meaningful completed Loop turn.
• Treat non-empty assistant text and tool/file/patch/artifact activity anywhere in the logical run as meaningful work.
• Classify a completed assistant run with no meaningful activity as empty.
• Let host-busy recovery settle an empty completed turn so finalization can handle it instead of waiting forever.
• Refund an empty logical run: restore runCount, lastRunAt, and a provisionally consumed --max-runs slot.
• Persist consecutive emptyTurnCount so restart/reload does not erase the safety streak.
• Retry one empty turn with the normal bounded busy delay, then pause after the second consecutive empty completion with a visible warning instead of spinning forever.
• Do not run normal success verification/checkpoint finalization for empty turns.
• Reset the empty-turn streak after a meaningful completed turn.
• Preserve tool-only work: a run that used a tool and ended with a blank assistant tail is still meaningful.

Regression coverage

New scripts/empty-turn-recovery-test.mjs covers blank/whitespace replies, text/tool activity, tool-then-blank tails, stale busy recovery, max-run refund/re-enable, one retry, second-empty pause, no success checkpoint on empty turns, and streak reset after real work.

The full source check + test suite passed on Node 24, the committed single-file src/index.js bundle was regenerated, node --check src/index.js passed, and the focused empty-turn recovery suite passed again against the generated bundle source head.

Temporary implementation workflows/scripts used to create and validate the patch were removed; the final diff contains only product/runtime/tests/bundle changes.

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