Add OMP provider support

[jenkei]

Scope

Add OMP provider support.

Fixes #297.

• Add OMP provider metadata and generated .omp/skills/impeccable output.
• Wire CLI provider aliases, display metadata, install/update path handling, and file download provider lookup for OMP.
• Update generated pin shortcuts to use harness-specific command prefixes.
• Tested provider output by rebuilding OMP output and comparing .omp/skills with dist/omp/.omp/skills.

Validation

• bun run build
• bun run test (repo-supported default harness per DEVELOP.md)
• tested OMP generated skill/install path (diff -qr .omp/skills dist/omp/.omp/skills; targeted OMP tests pass)
• README/docs only if needed — no README changes needed; generated-output policy now lists .omp/skills/.

Notes

• Opt-in bun run test:live-svelte-adapter-deepseek failed on a stale assertion: the UI now uses an icon button with aria-label="Generate variants" instead of visible "Go" text, so assertSelectedElementChrome's hasGo check is outdated. This is unrelated to the OMP provider changes.

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Note

Low Risk
Mostly generated docs and install/pin tooling; no runtime auth or data paths. Risk is limited to wrong invoke strings in pinned shortcuts if the prefix map drifts from a harness.

Overview
Adds OMP as a first-class install target with generated .omp/skills/impeccable content, wired through the existing cross-provider build (alongside CLI aliases, install/update paths, and download lookup described in the PR).

Pin shortcuts (pin.mjs across harness copies) now recognize .github, .qoder, and .omp, and embed the correct invoke syntax per harness instead of unresolved {{command_prefix}} placeholders. OMP pinned skills point at /skill:impeccable (and subcommands as /skill:…); Codex/Agents keep $, most others keep /.

The OMP skill bundle mirrors the full impeccable surface—main SKILL.md, scripts, and reference flows—with paths and command examples rewritten for .omp/skills/... and /skill: routing.

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[greptile-apps]

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