release: v0.48.0

[avifenesh]

Summary

• release current Claude Code skill and prompt-hook schema compatibility
• publish plugin-owned custom skill path resolution fixes
• synchronize Cargo, npm, VS Code, JetBrains, Zed, and Claude plugin versions to 0.48.0

Validation

• cargo test --workspace --locked
• cargo test --doc --workspace --locked
• cargo clippy --workspace --all-targets --all-features --locked -- -D warnings
• cargo fmt --all -- --check
• efficacy: 61/61, 100% precision/recall/F1
• agnix self-lint
• cargo audit and cargo deny advisories
• release builds for CLI, LSP, and MCP
• CLI/LSP version checks and MCP initialize handshake at 0.48.0
• rule bookkeeping parity: 447 rules