Add fabro-static::EnvVars as the shared registry for fixed environment variable names and migrate env reads, clap env bindings, and subprocess/test allowlists to use it.
Add clippy bans for raw std::env lookup APIs so future dynamic env facades must be documented explicitly.
Reuse the existing merge strategy type across CLI/API/GitHub paths, consolidate repeated PR command setup, and serialize server-side PR creation per run to avoid duplicate external work.
Returns exit code 4 whenever the CLI fails because the user needs to run
fabro auth login, so scripts and the install wizard can distinguish
re-auth from generic failures.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Lift shared client DTOs into fabro-types, move auth/target/error/session
logic into fabro-client, and reduce fabro-cli to orchestration around the
builder-based client path.
This also lands the remaining plan cleanup for ApiError, ServerTarget
canonicalization, and the RunEventStream rename at the CLI boundary.
