v0.3.1 — vault bloat fix & self-healing memory 🧹

Fix: vault memory files no longer grow to gigabytes — and existing installs self-heal.

• 🐛 Root cause fixed — the frontmatter writer in the vendored autograph scripts kept the old folded description line whenever it contained a :, doubling the value on every nightly rewrite (2^N growth: a card crossed 100 MB in two weeks and could reach gigabytes). Bloated cards OOM-killed both Iva and the nightly memory doctor. The writer now replaces folded values by indentation, enforce collapses any repeated description, and a hard cap keeps descriptions one-line forever.
• 🧹 New cleanup module in autograph — a surgical, bounded-memory cleaner: it streams even gigabyte .md files (peak RAM ~25 MB), collapses the duplicated garbage in the description block, copies the card body byte-for-byte and touches nothing else. Dry-run by default, --apply to fix; runs automatically as the first step of the nightly doctor and during iva update, so bloated vaults shrink back without manual steps.
• 🔄 Vendored skill scripts now follow the template — iva update, the nightly doctor and init-vault now sync the skill code (never schema.json, cards or any user data) from the template into the live vault, so every existing install picks up this fix — and future ones — automatically.

Just run iva update (or accept the update prompt in Telegram) — the bloated files are repaired during the update itself.