fix: reach active-window fallbacks without xdotool

[solomonneas]

Summary

• capture --target active no longer early-returns when xdotool is missing; gnome-screenshot -w / scrot -u stay in the fallback chain.
• Doctor reports LINUX_REACHABLE_HELPERS only (adds flameshot/xprop, drops unused spectacle/gdbus) and x11-active-window matches the same readiness predicate.
• Unit tests cover the planner and doctor/helper alignment.

Closes #19

Test plan

• brigade work verify run --target . --command "./scripts/verify" --capture brigade-work (118 tests)
• codex review --commit — no findings
• CI green on PR

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