MDA Compat Demo (OpenCode)

This skill exists to verify OpenCode SKILL.md compatibility from an MDA-compiled output.

Three things are true if OpenCode discovers and loads this skill:

1. The compiled SKILL.md parses under OpenCode's loader.
2. The frontmatter name matches the package directory name (spec §06-2.1 and OpenCode's own naming rules).
3. The five documented top-level fields (name, description, license, compatibility, metadata) plus MDA's integrity survive the round-trip from .mda source to compiled output to runtime ingest.

Source: compat/opencode/source.mda. Compile: mda compile compat/opencode/source.mda --target SKILL.md --out-dir compat/opencode/build --integrity.

What this does NOT prove:

• That OpenCode parses MDA-extended frontmatter under metadata.mda.* (the OpenCode docs do not document any such behavior, and we do not require it; per docs "unknown frontmatter fields are ignored", so passthrough is safe).
• That signatures or integrity digests are verified at load time (no current runtime does that).
• That allowed-tools is honored — OpenCode's public docs do not list this field. MDA may emit it (agentskills.io v1 envelope), but OpenCode's behavior on it is undocumented.