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merge: integrate README landing followup into ui2.0 #8

Job	Run time
changes	9s
test-linux-rust (server, -p webcodex)	5m 24s
test-linux-rust (runner, -p webcodex-runner -p webcodex-lsp --features runner-real-process-tests)	2m 34s
test-linux-tooling	1m 21s
test-linux-rust (workspace-crates, --workspace --exclude webcodex --exclude webcodex-runner --exc...	2m 54s
test-macos-desktop (darwin-arm64, macos-15, arm64, aarch64-apple-darwin)	21s
test-macos-core (darwin-arm64, macos-15, arm64, aarch64-apple-darwin)	4m 53s
test-windows-runner	7m 40s
test-windows-package	7m 50s
test-docker-server	11m 41s
contract	5m 17s
test-windows-desktop	56s
test-windows-core	8m 56s
test-macos	3s
test	4s
mcp-conformance	3m 12s
test-windows	4s
test-native	3s
	1h 3m 22s