docs: update README yara section — subcommand is wired, tested, and in CI

[warpedatom]

Summary by Sourcery

Documentation:

• Expand README documentation for the yara-scan feature, its gating requirements, behavior differences, and example offsetscan yara CLI invocations.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR updates the README’s YARA section to reflect that the offsetscan yara subcommand is now wired, tested, and exercised in CI, clarifying feature-gating, build requirements, behavior, and providing usage examples.

File-Level Changes

Change	Details	Files
Update README documentation for the yara-scan feature and offsetscan yara subcommand to describe current behavior, gating, CI coverage, and usage.	Remove outdated note that yara-scan is experimental, not built in CI, and untested against real rules. Describe the offsetscan yara subcommand, its record schema, and parity with Invoke-OffsetYaraScan. Clarify that the feature is gated and off by default, and document the need for a C toolchain and libclang due to the vendored libyara via bindgen. Note that a dedicated CI job builds and tests the feature on Linux with libclang installed. Explain lossy decoding of non-printable match bytes into Data and how this can diverge from the YARA CLI’s rendering. Add concrete usage examples showing how to build with --features yara-scan and invoke offsetscan yara over single files and recursive corpora with multiple rule files.	README.md

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[sourcery-ai]

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