gstack 1.75.0.0

Your review now hunts over-built code, not just broken code. And every skill's advice starts with "reuse before you build." This release imports the best of ponytail, the code-minimalism ruleset, without importing its build-less posture. /review gains an eighth lens: a simplification specialist that flags unrequested structure (hand-rolled stdlib, one-implementation abstractions, dead flexibility, dependencies duplicating platform features) in a closed five-tag vocabulary. It is advisory only. It cannot dent your quality score, its fixes are never auto-applied, and on a lean diff it tells you something no reviewer ever says: "lean already — nothing to cut." Every tier-2+ skill also gains the reuse ladder (stop at the first rung that holds: this repo, stdlib, native platform, an installed dependency... then build the complete version of what remains) and a bounded closer, so completion reports stop touring every edit. Accepted shortcuts now leave a durable trail: a decision-ledger entry plus a gstack-shortcut(dec- ) marker in code, harvested into a debt ledger by /retro. Agent hosts without a full install (Zed, Amp, Cursor side projects) get a 1.8KB rules digest to copy into their own rules file. And /autoplan now runs the Eng review last, always, so the required shipping gate reviews the final amended plan instead of a stale one. Added: Simplification review specialist, Reuse ladder, Bounded closer, Shortcut debt ledger, Instruction-only host tier, With/without-skill arm benchmark, /autoplan runs Eng last. Changed: AskUserQuestion preamble section, Terse-mode label, /review checklist. Fixed: Version bumps no longer strand the agents digest, The free-suite flaky retry, Version allocation, Browse temp paths, Setup's instruction-tier pointer, /retro's shortcut harvest. For contributors: New benchmarks and test improvements.