## Summary
This improves Slack support from setup through day-to-day operator
visibility. The server now resolves Slack credentials through the same
`process env -> server.env` path as other server secrets and logs
whether Slack is enabled or which credential variables are missing.
Run lifecycle notifications now use a structured Block Kit layout
instead of one dense markdown section. Messages get a header, workflow
summary, metadata fields, optional failure details, optional PR
metadata, and an Open in Fabro context link.
The public docs now explain local `server.env` setup, Docker/process-env
setup, expected startup logs, lifecycle smoke testing, terminal
`run.failed` semantics, and the current route-based
`[run.notifications]` format.
## Validation
- `cargo test -p fabro-slack`
- `cargo check -p fabro-server`
- `cargo +nightly-2026-04-14 fmt --check --all`
- `cargo dev docs check`
- `git diff --check`
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[](https://github.com/EveryInc/compound-engineering-plugin)
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