chore(tools): register csharp write tools and docs

[akiojin]

Summary

• Registered newly added C# LSP write tools in the CLI tool catalog so runtime lookup and manifest parity checks include them.
• Expanded the unity-csharp-edit skill guide with concrete command examples so contributors can use the new write/edit flow correctly.

Changes

• src/tool_catalog.rs: Added rename_symbol, replace_symbol_body, insert_before_symbol, insert_after_symbol, remove_symbol, validate_text_edits, and create_class to TOOL_NAMES and updated the parity-count test from 101 to 108.
• .claude-plugin/plugins/unity-cli/skills/unity-csharp-edit/SKILL.md: Added LSP write-tool usage examples, apply mode guidance, and namePath navigation notes.

Testing

• cargo test tool_catalog::tests::tool_catalog_keeps_manifest_parity_count -- --nocapture — parity test passes with updated tool count.

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 clippy/cargo fmt were not rerun for this docs+catalog commit.
• Documentation updated (if user-facing change) — N/A: this PR itself is tool-catalog/skill documentation alignment.
• Migration/backfill plan included (if schema/data change) — N/A: no schema/data changes.
• CHANGELOG impact considered (breaking change flagged in commit)

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