Pin BusyBox echo notice

[jacklv-coder]

Summary

• Pin the exact BusyBox 1.36.1 coreutils/echo.c bytes and inline Berkeley BSD notice.
• Bind the evidence to CONFIG_ECHO=y, CONFIG_FEATURE_FANCY_ECHO=y, and the pinned RootFS /bin/echo mapping to /bin/busybox.
• Advance the checksum-bound review manifests from 23/83 to 24/84 while keeping BusyBox coverage partial and all legal/redistribution gates closed.
• Update validators, tests, generated compliance evidence, and bilingual documentation.

Validation

• Codex CR: no P1/P2 findings
• Six RootFS compliance Ruby suites: 90 tests, 404 assertions, 0 failures
• Documentation check: 18 Chinese primaries, 18 English mirrors, all links and anchors valid
• Full Swift suite: 139 tests, 1 environment-only skip, 0 failures
• Explicit pinned RootFS integration test: passed
• Re-materialized and verified 24 license-review candidates and 84 notice payloads
• RootFS compliance generator --check and SHA256SUMS verification: passed

[jacklv-coder]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. What shall we delve into next?

Reviewed commit: 9749fd1d7a

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