v0.4.0 — Aperture

0.2 gated proof; 0.3 gated the seam of that proof. 0.4 adds the dial that decides how much of the loop to run at all: spend the full ratchet only when uncertainty earns it, and snap when it doesn't.

Added

• Aperture dial — ratchet score aperture <json> scores five uncertainty dimensions (ambiguity, terrain, taste, blastRadius, reversibility, each 0–2), maps the total to a level A0–A4, and returns the exact ratchet skill sequence to run at that depth — from build → verify (A0 Snap) up to lock → cut → decide with no build until constraints are locked (A4 Max). A missing dimension defaults to neutral (1), never certain (0), so unknown uncertainty opens the aperture rather than closing it.
• Aperture Read in /ratchet:ignite — the master loop now meters itself: it scores the task first and runs only the depth uncertainty earns, instead of always running all seven steps. /ratchet:lock gained a matching "meter what follows" note.

Changed

• /ratchet:ignite reframed from "run all seven; do not skip" to "run the aperture's metered sequence" — the seven-step pipeline is now the A2 default, not the floor.
• Bumped package, both plugin manifests, and the marketplace manifest to 0.4.0.

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63 tests pass (31 cli · 19 evolve · 13 plugin-shape). Versions aligned at 0.4.0; ratchet doctor healthy.

Provenance: grafted from an auto-aperture skill fork — we imported only its novel primitive (the uncertainty-scored dial) in ratchet's own dialect, and dropped the phases that already existed as cut/lock/decide/build/verify/compile.