closingd: implement option_simple_close (BOLT2)#9104

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nGoline:simple-close

Commits on May 14, 2026

tests: `add option_simple_close` integration tests
nGoline
committed
common: add `OPT_SIMPLE_CLOSE` feature bit (60/61)
nGoline
committed
common/close_tx: add `create_simple_close_tx()` for `option_simple_close`
nGoline
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channeld: reject `closing_complete` and `closing_sig` with a clear error
nGoline
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closingd: add `lightning_simpleclosed` for `option_simple_close`
nGoline
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lightningd: wire up `option_simple_close` master-side handling
nGoline
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test: add run-close_tx to validate simple-close transaction functionality
nGoline
committed