Skills now migrate from hand-authored plugin.json to Microsoft APM
(apm.yml + .apm/) per ADR-0015/issue #89. skill-author's write location
switches accordingly: walk up from the destination to the nearest
ancestor apm.yml declaring a type: field (skipping type:-less
marketplace-only manifests) and scaffold into <package-root>/.apm/skills/
<name>/. Standalone authoring (no apm.yml/.git anywhere, e.g.
~/.agents/skills/) is unchanged — only the old plugin.json-based path is
replaced, not standalone mode.
Refs: #89
Defame1297
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