fix: correct Cross build directory for LSP RC5

[AlexMikhalev]

RC4's musl lanes failed before compilation because the pinned Cross wrapper forwarded the host's absolute CARGO_BUILD_BUILD_DIR into a container where only CARGO_TARGET_DIR was remapped to /target. Omit the redundant build-directory override only for Cross subprocesses, preserving native command environments and filesystem permissions.

Advance only the server manifest, lock and release allowlist to 1.22.0-rc.5 for a new immutable release. Core remains 1.23.1; the published RC4 crate and tag stay unchanged. No LSP runtime implementation changes.

Validation:

• Reproduced the original permission error and corrected compile/run with real non-root, network-disabled Cargo 1.96 containers.
• Built the published RC4 crate with the corrected helper and exact pinned Cross revision for both x86-64 and ARM64 musl. The x86-64 binary passed version and actual save/reopen/synonym-export checks; ARM64 was architecture-checked without a runtime claim. These diagnostic outputs were not published.
• 123 Python release/guard tests; 262 native server tests and three benchmark smokes; strict Clippy, formatting and clean public manifest/lock validation.
• RC5 package built and verified against published crates.io dependencies. Focused protocol and CLI checks run from the extracted package.

The normal CI/release workflow must qualify and publish RC5 before its binaries are considered released.

[github-actions]

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