test: add coverage for vault.rs and frontmatter.rs before refactoring
Add 68 new tests covering previously untested functions:
vault.rs:
- parse_iso_date: full datetime, date-only, quoted input, invalid
- strip_markdown_chars: emphasis, backticks, links, wikilinks, empty
- capitalize_first: normal, empty, single char, already capitalized
- without_h1_line: starts with H1, blank lines, non-heading, empty
- infer_type_from_folder: all 15 known folders, unknown folder, frontmatter override
- extract_snippet: code fences, only headings, no H1, horizontal rules, unclosed FM
- contains_wikilink: true/false cases
- scan_vault_cached: incremental update with different commit
- created_at parsing from frontmatter
frontmatter.rs:
- to_yaml_value: all quoting cases (colon, hash, bracket, brace, bool, null, number)
- update_frontmatter_content: number, float, null, empty list, malformed FM
- delete: non-existent key (no-op), from no-frontmatter (no-op)
- line_is_key: quoted, single-quoted, leading whitespace, partial match
- with_frontmatter: file not found error
- format_yaml_key: colon, hash, period
- Roundtrip tests: string update, list update, add-then-delete
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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