Fixes for logic + new tests

[konstantinzolotarev]

No description provided.

[Copilot]

Pull request overview

This PR improves challenger logic (deduping in-flight challenges, safer error handling) and adds substantial test coverage around transaction confirmation polling and ScribeOptimistic provider behaviors, plus small operational/config updates (metrics/logging/CLI).

Changes:

• Add polling-interval configurability for WaitForTxConfirmation and introduce a comprehensive test suite for its edge cases.
• Update challenger/provider logic (in-flight dedupe, tick-error handling refactor, GetFrom caching, and PickUnchallengedPokes bug fixes) with new/expanded tests.
• Adjust Prometheus error metric labels and enhance CLI configuration (log level, metrics bind address, password-file newline trimming, graceful metrics server shutdown).

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
core/utils.go	Introduces txConfirmationPollInterval used by WaitForTxConfirmation.
core/utils_test.go	Adds thorough tests for WaitForTxConfirmation scenarios.
core/scribe_optimistic_provider.go	Adds cached GetFrom and replaces a panic with a returned error in GetChallengePeriod.
core/scribe_optimistic_provider_test.go	Expands provider tests (events fetching/decoding, signature validation, flashbot fallback, GetFrom caching).
core/challenger.go	Adds in-flight dedupe, refactors tick error handling, fixes PickUnchallengedPokes logic.
core/challenger_test.go	Adds extensive new tests for poke filtering, tick execution, run loop, and dedupe behavior.
core/metrics.go	Changes ErrorsCounter label set (drops error).
cmd/challenger/main.go	Adds --metrics-addr/--log-level, trims password-file newlines, improves metrics server lifecycle, updates cobra args handling.
.gitignore	Ignores /challenger binary/output.

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