refactor(e2e): replace fixed sleep with polling helpers in smoke test

[Copilot]

The c8_cmd wrapper used a fixed sleep after state-changing commands, making the smoke test flaky — assertions could fire before indexing completed on slow systems, or waste time on fast ones.

Changes

• Removed c8_cmd and C8_WAIT_TIME — the sleep-based propagation wait is gone entirely
• Added poll_until / poll_until_absent — retry the verification command every second until the expected condition appears (or disappears) or C8_TIMEOUT (default: 30 s) is reached
• Updated all state-change-then-verify flows to use the new helpers:

Test	After command	Polling condition
Deploy process	deploy	list pd contains simple-process
Run + list pi	run	list pi contains $INSTANCE_KEY
User task (appear)	run	list ut has a leading-digit line
User task (gone)	complete ut	list ut absent $UT_KEY
Message correlation (active)	create pi	list pi contains $INSTANCE_KEY
Message correlation (done)	publish msg	list pi absent ${INSTANCE_KEY}.*ACTIVE

• Removed duplicate test_pass function definition
• Added C8_TIMEOUT env var (default: 30) to allow per-environment tuning

# Example: run with a longer timeout on a slow environment
C8_TIMEOUT=60 ./smoke-test.sh

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