feat(core): optimize unity-cli runtime path and daemon workflow

[akiojin]

Summary

• Renamed legacy MCP-facing assets, handlers, and docs to unity-cli naming so repository semantics match runtime behavior and reduce maintenance confusion.
• Added and refined daemon-based execution paths (unityd control commands, transport-aware auto fallback, and batch invocation entrypoints) to reduce per-command connection overhead in LLM workflows.
• Improved execution throughput with Unity-side command queue draining and release-profile optimizations while aligning docs/specs to always-auto daemon behavior.

Changes

• src/main.rs, src/unityd.rs, src/cli.rs, src/config.rs, src/transport.rs, src/lspd.rs: wired daemon commands, auto-mode transport fallback behavior, batch routing, and related runtime/tests updates.
• UnityCliBridge/Packages/unity-cli-bridge/Editor/Core/UnityCliBridgeHost.cs and bridge handlers/models: renamed legacy MCP symbols and updated command-processing flow to drain queued requests in one processing cycle.
• Cargo.toml: enabled release optimizations (lto, codegen-units = 1, strip) to improve binary startup/runtime characteristics.
• docs/development.md and specs/SPEC-a7206673/*: documented always-auto daemon usage, added CLI examples (unityd, batch), and synchronized TDD/spec artifacts.

Testing

• cargo fmt --all -- --check — passed with exit code 0.
• cargo clippy --all-targets -- -D warnings — passed with exit code 0.
• cargo test --all-targets — passed (51 passed, 0 failed).

Related Issues / Links

• feat(core): migrate runtime to unity-cli and add unityd daemon #33
• None (no dedicated issue number for this follow-up branch work).

Checklist

• Tests added/updated
• Lint/format passed (cargo clippy, cargo fmt, svelte-check) — cargo clippy/cargo fmt passed; svelte-check N/A (no Svelte targets)
• Documentation updated (if user-facing change)
• Migration/backfill plan included (if schema/data change) — N/A: no schema/data migration
• CHANGELOG impact considered (breaking change flagged in commit) — considered; no dedicated CHANGELOG file in this repository

Context

• This branch continues post-merge work from PR feat(core): migrate runtime to unity-cli and add unityd daemon #33 and consolidates migration/performance commits that were not included in that merged range.

Risk / Impact

• Affected areas: Rust CLI command dispatch, daemon transport/runtime mode handling, Unity bridge request processing loop, and skill/documentation naming consistency.
• Rollback plan: Revert PR commits on feature/optimize-cli (or cherry-pick revert specific runtime commits) and republish the previous known-good CLI/UPM package revisions.

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