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ad75b147b5test: scale IPC mining wait timeouts by timeout_factor (Enoch Azariah)e7a918b69atest: verify IPC error handling for invalid coinbase (Enoch Azariah)63684d6922test: move make_mining_ctx to ipc_util.py (Enoch Azariah)4ada575d6ctest: verify createNewBlock wakes promptly when tip advances (Enoch Azariah) Pull request description: This is a follow-up to implement a couple of test improvements discussed in recent IPC PRs and issues. - adds a test to `interface_ipc_mining.py` to verify that `createNewBlock` wakes up immediately when the tip advances, rather than waiting for the cooldown timer to expire (https://github.com/bitcoin/bitcoin/pull/34184#discussion_r2842239399). - moves `make_mining_ctx` into `ipc_util.py` so it can be reused across the IPC tests instead of duplicating the setup code (https://github.com/bitcoin/bitcoin/pull/34422#discussion_r2852445430). - adds a test case to verify that providing an invalid coinbase to `submitSolution` returns a remote exception instead of crashing the node, closing the loop on the issue reported in #33341. - scales IPC wait timeouts using the test suite's `timeout_factor` to prevent spurious failures in heavily loaded CI environments, capping extended waits to avoid test runner hangs (bitcoin-core/libmultiprocess#253 (comment)). Closes #33341. ACKs for top commit: Sjors: ACKad75b147b5achow101: ACKad75b147b5sedited: ACKad75b147b5Tree-SHA512: 812aa64c03657761f06707e6a15b8b435ab7c75717a6748a919fcbcae317128e18403b0c1bddd4cdad877d286e69db52389633e4012faaa656acc01939091719