ci: add gemini-manual workflow and headless agent skills (#52)

### Overview
This PR introduces the headless Antigravity CLI remote GitHub Actions
workflow (`gemini - manual`) and associated repository skills to enable
remote development orchestration from GitHub Issues and Pull Requests.

### Key Changes
1. **GitHub Actions Workflow (`.github/workflows/gemini-manual.yml`)**:
   - Collaborator access guard (`OWNER`, `MEMBER`, `COLLABORATOR`).
   - Interactive emoji reactions (`eyes` and `rocket`).
- Multi-turn conversation persistence via `actions/cache@v4` on
`~/.gemini/antigravity-cli/conversations` and `brain/`.
   - Command dispatchers for `/plan`, `/implement`, and `/fix`.
   - Pre-push monorepo verification gates (`typecheck`, `lint`, `test`).
2. **Repository Skills (`.gemini/skills/`)**:
- `github-plan`: Handles `/plan` on issues with multi-turn iteration and
structured design outputs.
- `github-implement`: Handles `/implement` on issues, code generation,
verification, and PR creation.
- `github-fix`: Handles `/fix` on PRs/issues, auto-inspecting failing CI
logs and review comments.
3. **Project Guidelines (`GEMINI.md`)**:
   - Updated safety rules to allow automated GitOps workflows.

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Disclosure: I'm an AI assistant helping deytenit; I'm not deytenit.

services/docs/content/en/ermnvldmr/deployment-gitops.md

@@ -39,10 +39,10 @@ ci/k8s/
    * **Workflow**: `.github/workflows/services-docs-next-required.yml`.
    * **Action**: Builds Docker image, updates `ci/k8s/apps/docs/kustomization.yaml`, commits to `next`, and runs automated `verify-rollout`.
 
-2. **`services/www` (Semantic Release Dispatch)**:
-   * **Trigger**: Dispatched via `.github/workflows/services-www-releases-dispatch-release.yml`.
-   * **Standard Mode**: Runs full verification suite (Vitest, Storybook Playwright, Lint, Typecheck, Build) ➔ Tags git release ➔ Pushes image to GHCR ➔ Updates GitOps tag ➔ Runs `verify-rollout`.
-   * **Fast-Track Mode (`skip_ci: true`)**: Bypasses test suites for emergency deploys and rollbacks, immediately building the image, updating GitOps, and verifying the production rollout.
+2. **`services/www` (Trunk-Based CD with CalVer Release Gate)**:
+   * **Trigger**: Push to `next` modifying `services/www/**` or workspace dependencies (`packages/ui/**`, `packages/stl/**`, `packages/i18n/**`), or manual `workflow_dispatch`.
+   * **Workflow**: `.github/workflows/services-www-next-required.yml`.
+   * **Pipeline**: Full validation suite (Vitest, Storybook Playwright, Lint, Typecheck, Build) ➔ Builds Docker image with `sha-<commit>` tag ➔ Approval gate (`services-www-releases-publish`) tags CalVer `YYYY.MM.MICRO` in Git & GHCR ➔ Approval gate (`services-www-releases-deploy`) updates GitOps tag ➔ Runs `verify-rollout`.
 
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services/docs/content/ru/ermnvldmr/deployment-gitops.md

@@ -39,10 +39,10 @@ ci/k8s/
    * **Workflow**: `.github/workflows/services-docs-next-required.yml`.
    * **Действие**: Сборка Docker-образа, обновление `ci/k8s/apps/docs/kustomization.yaml`, коммит в `next` и запуск задачи `verify-rollout`.
 
-2. **`services/www` (Семантический релиз через Dispatch)**:
-   * **Триггер**: Запуск вручную через `.github/workflows/services-www-releases-dispatch-release.yml`.
-   * **Стандартный режим**: Полный цикл тестов (Vitest, Storybook Playwright, Lint, Typecheck, Build) ➔ Git-тег релиза ➔ Пуш в GHCR ➔ Обновление тега в GitOps ➔ Проверка через `verify-rollout`.
-   * **Быстрый режим (`skip_ci: true`)**: Пропуск тестов для экстренных деплоев и откатов с мгновенной сборкой образа, пушем в GitOps и верификацией.
+2. **`services/www` (Trunk-Based CD с релизным гейтом CalVer)**:
+   * **Триггер**: Push в ветку `next` с изменениями в `services/www/**` или зависимых пакетах (`packages/ui/**`, `packages/stl/**`, `packages/i18n/**`), либо ручной `workflow_dispatch`.
+   * **Workflow**: `.github/workflows/services-www-next-required.yml`.
+   * **Пайплайн**: Полный цикл тестов и проверок (Vitest, Storybook Playwright, Lint, Typecheck, Build) ➔ Сборка Docker-образа с тегом `sha-<commit>` ➔ Гейт подтверждения (`services-www-releases-publish`) выставляет тег CalVer `YYYY.MM.MICRO` в Git и GHCR ➔ Гейт подтверждения (`services-www-releases-deploy`) обновляет GitOps ➔ Проверка раскатки через `verify-rollout`.
 
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