chore(skills): move upstream skills to the CLI global store, keep authored tier

Retroactive provenance: the 10 pi-era skill snapshots were byte-identical
to upstream. Canonical installs now live in ~/.agents/skills tracked by
~/.agents/.skill-lock.json (mattpocock/skills x38 after grilling removal,
find-skills from vercel-labs/skills).

Repo tier is authored overrides only: clear all 10 tracked upstream
snapshots; omp loads the store directly through the agents provider
(skills.enableAgentsUser, default on). grilling returns as a real
directory — extracted from the store (CLI + lockfile pruned) so Frank can
customize it without skills update resurrecting a twin.

Docs: skill-store-wiring.md (+index). Pre-cutover snapshot of the old
tracked dirs at /tmp/agent-skills-snap-20261018.

omp-docs/tools/vercel-labs-skills/skill-store-wiring.md

@@ -0,0 +1,63 @@
+---
+type: reference
+title: omp Skill Store Wiring
+description: Division of skill tiers on Dank workstations — skills CLI global store, omp agents provider, and the authored repo tier.
+tags:
+  - skills
+  - provisioning
+  - dotfiles
+timestamp: 2026-10-18
+verified: 2026-10-18
+---
+
+# omp Skill Store Wiring
+
+Three tiers, one owner each:
+
+| Tier | Path | Owner | Content |
+|---|---|---|---|
+| Canonical store | `~/.agents/skills/` | `skills` CLI | upstream skills, 38 as of 2026-10-18 (all `mattpocock/skills`) |
+| Provenance | `~/.agents/.skill-lock.json` | `skills` CLI | v3 lockfile: `source`, `skillPath`, `skillFolderHash` per skill |
+| Authored | `agent/skills/` (this repo) | Frank, via PR | hand-customized overrides; today only `grilling` |
+
+## How omp loads them
+
+omp is NOT a registered agent in the `skills` CLI (79-agent registry checked
+2026-10-18; see [Agent Support](/tools/vercel-labs-skills/agent-support.md)) —
+`skills add` never writes anywhere under `~/.omp`. Instead omp's own `agents`
+provider reads the store **directly**: `skills.enableAgentsUser` (default true)
+loads `~/.agents/skills/*/SKILL.md`. No per-skill symlinks in the repo — the
+repo does not mirror the store; it only holds authored overrides.
+
+Precedence (omp `omp://skills.md`): authored `agent/skills/` (native, priority
+100) beats the agents provider; identical copies collapse by realpath, differing
+same-named copies survive namespaced (`agents/<name>`) with a startup warning.
+Therefore: **when authoring an override, remove the skill from the store**
+(`npx skills remove <name> -g`) so the lockfile stays truthful and no
+namespaced twin haunts the listing. `grilling` was extracted this way 2026-10-18.
+
+## Updating upstream skills
+
+```bash
+npx -y skills update -g            # refreshes everything the lockfile tracks
+npx skills check                   # drift report vs GitHub tree SHAs
+```
+
+Fresh workstation (omp side is two commands — store restore + authored tier
+arrives with the repo clone):
+
+```bash
+npx -y skills add mattpocock/skills --all -g
+npx -y skills add vercel-labs/skills --skill find-skills --agent universal -g
+npx -y skills remove grilling -g   # authored copy ships in the repo
+```
+
+## Managed tier
+
+`agent/managed-skills/` (auto-learn, priority 5) is separate and untouched by
+all of the above; authored skills always win name collisions against it.
+
+## Related
+
+* [Lock File](/tools/vercel-labs-skills/lock-file.md) — hash-based update checking
+* [Agent Support](/tools/vercel-labs-skills/agent-support.md) — full CLI agent registry