docs: propose ProvenanceEnvelope contract #1116

Job	Run time
windows-native-acceptance	55s
repo-metadata	21s
component-manifest-provenance	14s
lint	23s
install-from-source (repo+claude+publisher, --depth repo --harnesses claude --include publisher)	24s
changes	7s
content-guard	7s
quickstart-smoke (macos-latest)	21s
test (3.11)	10m 24s
quickstart-smoke (windows-latest)	58s
test (3.12)	14m 56s
test (3.10)	11m 6s
quickstart-smoke (ubuntu-latest)	19s
install-from-source (kitchen-sink, --depth workspace --harnesses claude,codex,openclaw,hermes)	22s
install-from-source (workspace+codex+openclaw, --depth workspace --harnesses codex,openclaw)	22s
install-from-source (workspace+hermes, --depth workspace --harnesses hermes)	22s
install-from-source (workspace+claude+openclaw, --depth workspace --harnesses claude,openclaw)	19s
install-from-source (workspace+none, --depth workspace --harnesses none)	19s
install-from-source (repo+codex, --depth repo --harnesses codex)	25s
install-from-source (repo+claude, --depth repo --harnesses claude)	24s
Windows (stable, default features)	0s
MSRV (Rust 1.85)	0s
build-and-test	0s
Feature configuration (${{ matrix.name }})	0s
evidence-ledger-test	0s
notify-build-and-test (ubuntu-latest)	0s
notify-build-and-test (windows-latest)	0s
	43m 8s

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