[bourumir-wyngs]

Expand regression coverage for quoted scalar continuations accepted by default after #53.

• Exercise 162 indentation/folding variants: both quote styles, zero to two blank lines, uniform LF/CRLF and mixed line endings, and block mappings, sequences, nested/compact mappings, and explicit keys.
• Assert literal folded scalar values in addition to comparing events with conforming input.
• Add 32 sibling-entry cases to verify that parsing resumes in the correct mapping or sequence after an under-indented continuation.
• Reuse the existing checks for default/explicit relaxed parsing, strict error kinds and positions, all parser input backends, and direct scanning.

Only tests/strict.rs changes.

Validation: GitHub CI passed on commit 57be08b, including Linux/macOS tests with and without parser comments, formatting, Clippy, coverage, MSRV, and no_std checks. API compatibility and CodSpeed also passed. Project tests were not executed locally.

[codspeed]

Merging this PR will not alter performance

✅ 29 untouched benchmarks

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_{Comparing test/additional-quoted-continuation-cases (57be08b) with master (5eacd65)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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