docs: add engine consolidation decision RFC (#588) #1125

Job	Run time
component-manifest-provenance	18s
repo-metadata	15s
test (3.10)	12m 11s
lint	22s
test (3.11)	10m 28s
quickstart-smoke (ubuntu-latest)	23s
quickstart-smoke (macos-latest)	27s
changes	4s
windows-native-acceptance	58s
test (3.12)	10m 57s
content-guard	6s
quickstart-smoke (windows-latest)	1m 5s
install-from-source (workspace+claude+openclaw, --depth workspace --harnesses claude,openclaw)	21s
install-from-source (repo+codex, --depth repo --harnesses codex)	19s
install-from-source (workspace+codex+openclaw, --depth workspace --harnesses codex,openclaw)	16s
install-from-source (repo+claude+publisher, --depth repo --harnesses claude --include publisher)	18s
install-from-source (repo+claude, --depth repo --harnesses claude)	26s
install-from-source (kitchen-sink, --depth workspace --harnesses claude,codex,openclaw,hermes)	25s
install-from-source (workspace+hermes, --depth workspace --harnesses hermes)	23s
install-from-source (workspace+none, --depth workspace --harnesses none)	27s
build-and-test	-1s
notify-build-and-test (ubuntu-latest)	-1s
notify-build-and-test (windows-latest)	-1s
Windows (stable, default features)	-1s
MSRV (Rust 1.85)	-1s
evidence-ledger-test	-1s
Feature configuration (${{ matrix.name }})	-1s
	40m 22s

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