Replace the Chat sandbox when its pasted key entries change - #820
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Drukbox binds the entries of a pasted API key when it creates a box. Chat matched the account's sandbox only by the secrets the box fetches, so a new key, or a harness that reads the key from another variable, kept the old sandbox. For example, after a switch from OpenCode to Codex on one OpenAI key, Codex failed with "The sandbox environment lacks CODEX_API_KEY."
AgentConfig.secrets_idbecomessecrets_hash, a SHA-256 digest in both billing modes: of the pasted key's version and its entries without the value, or of the subscriptions the box fetches. A sandbox identity now records the hash of the agent config that created its box. Chat replaces the sandbox when the hash changes, asdocs/chat.mdalready describes for a change of the Chat credentials. Workflow boxes record the hash too.