fix: rename README.md to SKILL.md when copying skill directory

[jaehoonkim-x]

Summary

When copying a skill directory using add-skill, the README.md file is copied as-is into the target directory. However, the agent runtime looks for SKILL.md, not README.md, so the skill metadata is not found correctly.

Changes

In apps/cli/src/commands/add-skill.ts, the copy logic now renames README.md → SKILL.md during the copy operation:

const githubDisplayFilename = "README.md";
const agentSkillFilename = "SKILL.md";
// ...
const targetEntry = entry === githubDisplayFilename ? agentSkillFilename : entry;
fs.cpSync(path.join(sourceDir, entry), path.join(targetDir, targetEntry), { recursive: true });

Fork / Branch

The fix is ready on my fork: https://github.com/jaehoonkim-x/expect/tree/main

Would love to have this merged. Please let me know if you'd like me to open a PR once collaborator access is granted, or if there's another preferred contribution path.

[jrhe]

Hit the same does not have the correct permissions to execute CreatePullRequest blocker @jaehoonkim-x mentioned, so leaving the work on a fork branch in case it's useful to a maintainer:

Branch: jrhe/expect@fix/skill-md-copy-rename
Compare view: main...jrhe:expect:fix/skill-md-copy-rename

The change:

• copySkillDirectoryContents: maps README.md → SKILL.md when copying from the shared source to each agent's skill dir (matches the fix proposed in this issue).
• haveMatchingContents: applies the same mapping when comparing top-level entries, so subsequent expect init runs correctly report already-copied instead of re-copying every time.
• Two new tests in apps/cli/tests/add-skill.test.ts covering both behaviours.
• Changeset included.

pnpm --filter expect-cli test → 158/158 passing. pnpm --filter expect-cli typecheck clean.

For context: introduced by e01aa5c (renamed source to README.md to serve via the website's llms.txt route), but the CLI copy logic wasn't updated. Repro: npx expect-cli init -y fails with copied skill is missing SKILL.md for all five agents on a clean machine.

Happy to defer entirely to @jaehoonkim-x's branch if preferred.