Move the Environment Variables section from the Settings tab into its
own "Environment" tab (KeyRound icon) between Tasks and Settings. Each
tab now has independent save state.
1. Security: add isBlockedEnvKey() blocklist that rejects MULTICA_*
prefix and critical system vars (HOME, PATH, USER, SHELL, TERM,
CODEX_HOME) from custom_env injection
2. Observability: log warnings when json.Unmarshal fails on custom_env
(agentToResponse + claim endpoint)
3. UX: use stable auto-increment IDs for env entry React keys instead
of array index to prevent input focus/state issues on add/remove
Add per-agent custom_env configuration that gets injected into the agent
subprocess at launch time. This enables users to configure custom API
endpoints (ANTHROPIC_BASE_URL), API keys (ANTHROPIC_API_KEY), and cloud
provider modes (CLAUDE_CODE_USE_BEDROCK, CLAUDE_CODE_USE_VERTEX) without
requiring code changes.
Changes:
- Migration 040: add custom_env JSONB column to agent table
- Backend: custom_env in agent CRUD API + claim endpoint
- Daemon: merge custom_env into subprocess environment variables
- Frontend: env var editor in agent settings (key-value pairs with
visibility toggle for sensitive values)
Closes#816
Related: #807, #809
