feat: add running-process daemon diagnostics

[zackees]

Summary:

• Add fbuild daemon running-process diagnostics with --json output.
• Add fbuild daemon servicedef as an alias for the same preview.
• Report service name, SHARED_BROKER isolation, computed service-definition path, current direct-fallback mode, daemon binary candidate/existence, and explicitly deferred broker work.

Stubbed / deferred:

• Binary .servicedef encoding/install.
• Active BackendHandle endpoint-response probing.
• running_process::broker::client::connect_to_backend / Hello-skip broker path.
• Broker/direct integration matrix.
• Full lint/dylint and broad three-OS acceptance.

Critical Windows host checks:

• soldr rustfmt --edition 2021 crates\fbuild-cli\src\cli\args.rs crates\fbuild-cli\src\cli\daemon_cmd.rs crates\fbuild-cli\src\cli\tests.rs
• git diff --check
• soldr cargo test -p fbuild-paths running_process -- --nocapture
• soldr cargo test -p fbuild-cli daemon_running_process -- --nocapture
• soldr cargo test -p fbuild-cli daemon_servicedef -- --nocapture
• soldr cargo check -p fbuild-cli
• soldr cargo run -p fbuild-cli -- daemon running-process --json
• soldr cargo run -p fbuild-cli -- daemon servicedef --json

Refs #510
Refs zackees/running-process#242
Refs zackees/running-process#228

[coderabbitai]

Warning

Review limit reached

@zackees, we couldn't start this review because you've reached your PR review rate limit.

More reviews will be available in 5 minutes and 25 seconds. Learn how PR review limits work.

Your organization has run out of usage credits. Purchase more in the billing tab.

⌛ How to resolve this issue?

After more reviews become available, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans include higher PR review limits than trial, open-source, and free plans. In all cases, reviews become available again over time. During sustained high-volume PR review activity, CodeRabbit may temporarily slow when the next review becomes available.

Please see our Fair Usage Limits Policy for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: facd999c-813c-4c8b-84a5-108496ec5e24

📥 Commits

Reviewing files that changed from the base of the PR and between 8103898 and 11c4921.

📒 Files selected for processing (3)

• crates/fbuild-cli/src/cli/args.rs
• crates/fbuild-cli/src/cli/daemon_cmd.rs
• crates/fbuild-cli/src/cli/tests.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/rp-diagnostics-preview

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}