fix(jobs): correct Windows-only cfg gates that break the workspace clippy gate

[getappz]

Two cfg bugs in crates/agentflare-jobs/src/supervisor.rs, introduced by PR #443 (65f0788), that make the workspace clippy gate fail on a clean checkout on Windows. Neither changes behavior on Linux or macOS.

1. descendant_pids's non-Linux stub is unreachable on Windows. It was gated #[cfg(not(target_os = "linux"))], but its only caller (kill_graceful) sits inside #[cfg(unix)]. On Windows the stub compiles while its caller does not, leaving it genuinely dead code. Narrowed to #[cfg(all(unix, not(target_os = "linux")))], which is the macOS/BSD case it was actually written for.

2. The test module's glob import is unused off Linux. That module has exactly one test and it is #[cfg(target_os = "linux")]-gated, so use super::*; is unused on every other platform. Gated it to match.

Why this is being opened now

Item #440 was filed and marked completed on 2026-08-11, but the fix never shipped: the commit only ever existed on an unpushed local branch, no PR was opened, and master still fails the gate today. It surfaced again while verifying item #435 (PR #459), where this pre-existing failure blocked a workspace-wide clippy run — I deliberately kept it out of that PR rather than folding in an unrelated fix.

Verification

Rebased onto current master (0d552e0), so this includes #459's newly-merged resource-gate crate.

cargo clippy --workspace --all-targets -- -D warnings -A unsafe_code -A clippy::pedantic now completes clean on Windows. Before this change the same command failed with:

error: function `descendant_pids` is never used
   --> crates\agentflare-jobs\src\supervisor.rs:208:4
error: unused import: `super::*`
   --> crates\agentflare-jobs\src\supervisor.rs:281:9

The Linux-gated test itself is unchanged.

[coderabbitai]

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ℹ️ Recent review info

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• crates/agentflare-jobs/src/supervisor.rs

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📝 Walkthrough

Walkthrough

The supervisor module now limits the descendant_pids fallback to non-Linux Unix targets. The test import is limited to Linux targets.

Changes

Platform compilation

Layer / File(s)	Summary
Supervisor platform gating crates/agentflare-jobs/src/supervisor.rs	The descendant_pids fallback compiles only on non-Linux Unix platforms. The test-module import compiles only on Linux.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• getappz/agentflare#394: Introduced the descendant_pids functionality refined by this platform-specific compilation change.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the Windows cfg-gate fixes and their effect on the workspace Clippy gate.
Description check	✅ Passed	The description explains the changes, motivation, platform impact, and Clippy verification, but omits the template checklist and reviewer notes.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch task/440

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