Feat/execution contract#538

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romamo wants to merge 8 commits intogoogleworkspace:mainfrom

romamo:feat/execution-contract

Commits on Mar 18, 2026

feat(agent): improve execution contract for agent reliability
romamo
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docs: document agent execution contract in README
romamo
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fix: propagate SIGTERM registration failure instead of panicking
romamo
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fix: single source of truth for exit code taxonomy, handle serialization error
romamo
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fix: derive EXIT_CODE_DOCUMENTATION from table, fix wrong mapping in docs
romamo
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fix: enforce advertised timeout on HTTP client, reject empty idempotency key
romamo
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test: use HashSet equality in exit codes test to catch duplicates and extras
romamo
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refactor: const fn for EXIT_CODE_DOCUMENTATION, shared SIGTERM registration
romamo
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