proposal-rename-proposal-template

Proposal: Rename proposal.md to change-proposal.md

What

Rename vault/_templates/proposal.md to vault/_templates/change-proposal.md and update type: proposal to type: change-proposal in the frontmatter.

Why

Proposals can be new feature requests (using the feature-request template) or changes to existing files (using this template). The name proposal.md is ambiguous — it suggests all proposals use this template. change-proposal.md makes clear this template is for proposing changes to existing files/systems.

Spec

1. Rename vault/_templates/proposal.md → vault/_templates/change-proposal.md
2. Update frontmatter type: proposal → type: change-proposal
3. Update vault-validator.py REQUIRED_FIELDS: rename proposal key to change-proposal
4. Update existing files with type: proposal to type: change-proposal

Impact

• vault/_templates/proposal.md — renamed
• .claude/hooks/vault-validator.py — REQUIRED_FIELDS key rename
• All existing type: proposal files in vault — frontmatter update
• Skills/docs that reference the proposal template — update references