feat: complete gwt spec implementation

[akiojin]

Summary

• Complete the gwt-spec implementation slice across Unity bridge tools, local C# tooling, release automation, and documentation.
• Add focused coverage for Unity handlers, script release helpers, and skill/release contract behavior so the completed specs can be released with traceable verification.

Changes

• UnityCliBridge/Packages/unity-cli-bridge: adds editor menu/window entrypoints, capture path resolution, expanded handler behavior, and focused Editor/PlayMode test coverage.
• src/app, src/core, src/tooling: updates CLI runtime behavior, instance handling, local C# tools, and tool catalog coverage for the completed spec surfaces.
• scripts/release, .github/workflows/release.yml, .agents/skills/gh-pr, .claude/commands/release.md: syncs release version automation, release lint gating, and ensures gwt-spec issues flow into release PR Closing Issues.
• docs and .gwt/work: updates user/developer docs, skill/tool docs, configuration docs, and gwt memory/coordination records.

Testing

• git diff --check — no whitespace errors.
• bash tests/scripts/release-closing-issues-test.sh — pass.
• node --test tests/scripts/*.mjs — 8 tests passed.
• bash -n scripts/publish.sh scripts/prepare-release-pr.sh scripts/release/collect-closing-issues.sh scripts/install.sh scripts/switch-unity-manifest.sh — syntax check passed.
• node --check scripts/release/update-versions.mjs && node --check scripts/upm/sign-upm-package.mjs — syntax check passed.
• cargo fmt --all -- --check — pass.
• cargo test --all-targets -- --test-threads=1 — 414 tests passed.
• cargo clippy --all-targets -- -D warnings — pass.
• cargo run -- skills lint --severity error --format text — 15 skills checked, 0 violations.
• npx --yes markdownlint-cli README.md CONTRIBUTING.md CLAUDE.md RELEASE.md docs/configuration.md docs/development.md docs/constitution.md docs/skills.md docs/tools.md .github/workflows/README.md --config .markdownlint.json --ignore-path .markdownlintignore — pass.
• npx --yes prettier --check package.json RELEASE.md docs/configuration.md docs/development.md docs/skills.md docs/tools.md .github/workflows/release.yml tests/scripts/*.mjs scripts/release/update-versions.mjs scripts/upm/sign-upm-package.mjs — pass.

PR Readiness

• State: Ready for review
• Releaseable slice: Yes; this is a single completed gwt-spec implementation slice with rollback covered by reverting the PR commit before release.
• Known blockers: None.
• Remaining acceptance: None; GitHub Actions are green and merge state is clean.
• User Verification Result: skipped(user requested Ready PR after automated verification and CI checks; no separate manual UI check requested).

Closing Issues

Closes #146
Closes #147
Closes #148
Closes #149
Closes #150
Closes #151
Closes #152
Closes #153
Closes #154
Closes #155
Closes #156
Closes #157
Closes #160
Closes #204

Related Issues / Links

None

Checklist

• Tests added/updated
• Lint/format passed (cargo clippy, cargo fmt, markdownlint, prettier)
• Documentation updated
• Migration/backfill plan included — N/A: no schema/data migration
• CHANGELOG impact considered — N/A: release notes are handled by release automation

Context

• This PR consolidates the completed gwt-spec implementation and verification work so the release PR can re-collect Closing Issues and close the completed specs on main merge.

Risk / Impact

• Affected areas: Unity bridge editor/runtime tooling, Rust CLI command/tool execution, release workflow, documentation, and gwt coordination records.
• Rollback plan: Revert this PR as one commit before release if CI or review identifies a blocking regression.

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