feat: add /vault-upgrade for migrating existing vaults (#6)

Merge pull request #5 from breferrari/fix/cross-platform-hook-scripts

fix: address Copilot review feedback

fix: cross-platform hook script reliability

Merge pull request #4 from breferrari/feat/humanize-weekly

fix: address Copilot review feedback on /weekly

docs: add validate-write fixes to CHANGELOG v3.2

fix: add thinking/ to validate-write skip list

fix: normalize path separators in PostToolUse hook validation

feat: add /humanize and /weekly commands (v3.2)

fix: cross-platform Python resolution in hook commands

Merge pull request #3 from breferrari/brenno/vault-first-memory

Address Copilot review: agent frontmatter, strict mode, MEMORY.md exception, review-brief arg

Add v3.1 changelog entry

Add vault-first memory system, review writing skills, and charcount utility