Port v0.57.0: detect whitespace turn_context candidates

[Finesssee]

Problem

Upstream v0.57.0 commit 2188c90 accepts valid Codex JSONL event records with legal whitespace. The Windows port's candidate filter recognized compact turn_context records but could discard whitespace-formatted records before the existing JSON parser saw them.

Change

• Admit generic turn_context candidate text in the existing Codex candidate gate.
• Add focused parity coverage for compact versus whitespace/tab-spaced event_msg and turn_context records.
• Keep unrelated response records rejected.

This is the first isolated micro-PR on the v0.57.0 integration branch. It does not change parsing, cache/checkpoint behavior, scan ordering, recovery, versions, scripts, or documentation.

Validation

• git diff --check passed.
• cargo fmt --all -- --check passed.
• Focused Cargo test and cargo check --tests were attempted but could not execute because this host has no cl.exe; PATH resolves Git's usr/bin/link.exe, which fails the MSVC linker invocation with link: extra operand.
• The staged and committed diff contains only:
  • rust/src/core/jsonl_scanner/codex/helpers.rs
  • rust/src/core/jsonl_scanner/tests.rs

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