v0.1.6

Changes

• Add opt-in research report files via taskr research <task_id> <file.md>, recorded as research_files in task frontmatter.
• Add taskr list -n N / --number N with default 10 items, stable status sorting, and updated timestamps in output.
• Bump package version to 0.1.6 and format markdown renderer files so the publish workflow passes.

Verification

• npm run format:check
• npm run check
• npm pack --dry-run