Reset stateful regex log waits between matches

[cristianrgreco]

Summary

• reset regular expression cursor state before matching container log lines
• strengthen restart coverage with a global regular expression
• document the red-green-refactor workflow for future bug regression tests in AGENTS.md

Verification

• red: temporarily removed the implementation fix and ran npm test -- packages/testcontainers/src/wait-strategies/log-wait-strategy.test.ts -t "should wait for a new log after restart"; it failed after restart with Log stream ended and message "/Ready/g" was not received
• green: restored the fix and reran npm test -- packages/testcontainers/src/wait-strategies/log-wait-strategy.test.ts -t "should wait for a new log after restart"; it passed
• npm run format
• npm run lint
• npm run check-compiles
• git diff --check

Compatibility

This is a backward-compatible bug fix. String and non-stateful regular expression waits are unchanged.

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