fix(lsp): preserve safe defaults and actionable errors

[akiojin]

Summary

• Updated src/lsp.rs remove-symbol request building to omit failOnReferences when unset so backend reference checks stay enabled by default.
• Updated src/local_tools.rs local LSP write fallback to execute directly in auto/required modes so actionable backend errors are not masked by a generic message.
• Updated src/local_tools.rs class generation to add using UnityEngine; for MonoBehaviour inheritance and added regression tests to keep generated Unity scripts compilable.

Changes

• src/lsp.rs: Changed handle_remove_symbol to preserve backend defaults for failOnReferences and added request-construction tests.
• src/local_tools.rs: Changed local_lsp_write fallback behavior to propagate direct LSP errors in auto/required modes.
• src/local_tools.rs: Changed local_create_class to emit using UnityEngine; for inherits: "MonoBehaviour" and updated class-generation tests.

Testing

• cargo fmt — formatter completed successfully.
• cargo test — 57 passed, 0 failed.

Related Issues / Links

• feat(lsp): unity-mcp-serverから移行未完了のC#編集ツールをLSP経由で公開する #40

Checklist

• Tests added/updated
• Lint/format passed (cargo clippy, cargo fmt, svelte-check) — cargo fmt passed; cargo clippy and svelte-check were not run in this PR.
• Documentation updated (if user-facing change) — N/A: internal CLI/LSP behavior change only.
• Migration/backfill plan included (if schema/data change) — N/A: no schema or data changes.
• CHANGELOG impact considered (breaking change flagged in commit)

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