chore: configure GigaCode — add MCP servers, skills, and update gitignore

.agents/skills/review-changes/SKILL.md

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+---
+name: review-changes
+description: Ручное ревью всех изменений после последнего коммита (безопасность, качество кода, сохранение паттернов, общие принципы построения приложения). Запускать вручную в новой сессии.
+disable-model-invocation: true
+model: opus
+effort: high
+---
+
+Review all the changes made after the last commit for security, code quality, preservation of existing patterns, and general principles of application construction.
+
+## Scope
+
+- Take the diff of everything after the last commit: `git diff HEAD` plus untracked files from `git status --short` (read them in full).
+- Read the surrounding code, callers, tests, and configs the changes touch. Do not judge a hunk in isolation.
+- Read the project's CLAUDE.md and treat its rules as the baseline for "patterns" and "principles".
+
+## Checklist
+
+1. **Security:** missing validation at trust boundaries, auth and access rules (per-user isolation), injection/XSS, secrets in code or config, unsafe defaults, data loss on errors.
+2. **Code quality:** bugs, unhandled edge cases, error handling, dead code created by these changes, needless complexity, missing tests for non-trivial logic.
+3. **Pattern preservation:** does the new code match the naming, structure, idioms, and conventions of the surrounding code and the rules in CLAUDE.md? Flag any deviation or reinvented helper that already exists.
+4. **General principles:** single responsibility, feature-based boundaries, no premature abstractions, no speculative code, no changes outside the scope of the task.
+5. **Frontend / visual design (only if the changes touch the frontend or visuals):** invoke the skills `ui-ux-pro-max` and `frontend-design` (`frontend-design:frontend-design`) via the Skill tool and review the UI changes against them (layout, typography, color, responsiveness, accessibility, interaction). Verify the real rendering in the browser via the Playwright MCP (`mcp__playwright__*`: snapshot, screenshot, console messages, `browser_resize` for responsive sizes). Skip this item when there are no frontend/visual changes.
+
+## Rules
+
+- This is a review only: do NOT edit files, do NOT commit.
+- Report only real, verified issues; no style nitpicks and no praise padding.
+- Answer in Russian. Keep code identifiers, commands, and paths as is.
+
+## Output
+
+List findings by severity (critical / important / minor). For each: `file:line`, what is wrong, a concrete failure scenario, a suggested fix. If nothing is found, say so in one line and name what you checked.