fix: parse grouped skills list output

[nguyenngothuong]

Summary

Fix the incremental skills sync local-skill detection when npx skills ls -g prints grouped, indented human-readable output. The parser now recognizes indented skill rows without treating category headings as skills.

Changes

• Allow global skills parser to parse indented skill rows that include a skill path.
• Ignore category headings, including multi-word headings, by requiring the second token to look like a path.
• Add regression coverage for the grouped output shape reported in lark-cli update incremental skills sync does not detect installed skills from grouped skills ls output #1186.

Test Plan

• Unit tests pass: go test ./internal/skillscheck -count=1
• Unit tests pass: go test ./cmd/update -count=1
• Unit tests pass: go test ./internal/skillscheck ./cmd/update -count=1
• Manual local verification confirms the lark-cli update flow works as expected

Related Issues

• Fixes lark-cli update incremental skills sync does not detect installed skills from grouped skills ls output #1186

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