feat(cli): add session offload command

[dzianisv]

Adds JSONL session archive/import CLI with age-based verified deletion, storage metrics, and optional vacuum.\n\nTests:\n-
• Packages in scope: @opencode-ai/app, @opencode-ai/cli, @opencode-ai/client, @opencode-ai/codemode, @opencode-ai/console-app, @opencode-ai/console-core, @opencode-ai/console-function, @opencode-ai/console-mail, @opencode-ai/console-resource, @opencode-ai/console-support, @opencode-ai/core, @opencode-ai/desktop, @opencode-ai/effect-drizzle-sqlite, @opencode-ai/effect-sqlite-node, @opencode-ai/enterprise, @opencode-ai/function, @opencode-ai/http-recorder, @opencode-ai/httpapi-codegen, @opencode-ai/llm, @opencode-ai/plugin, @opencode-ai/protocol, @opencode-ai/schema, @opencode-ai/script, @opencode-ai/sdk, @opencode-ai/sdk-next, @opencode-ai/server, @opencode-ai/session-ui, @opencode-ai/slack, @opencode-ai/stats-app, @opencode-ai/stats-core, @opencode-ai/stats-server, @opencode-ai/storybook, @opencode-ai/tui, @opencode-ai/ui, @opencode-ai/web, opencode
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Tasks: 30 successful, 30 total
Cached: 30 cached, 30 total
Time: 141ms >>> FULL TURBO\n- bun test v1.3.14 (d1632b29)

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