feat: convert mdbook to Grav format (199 pages)

Converted from mdbook src/ in input/ to Grav pages/ format:
- Added YAML frontmatter to all pages
- Created numbered folder structure (01.home, 02.Bylaws.*, etc.)
- Preserved all content from Bylaws, Handbook, OperatingAgreements,
  Policies, and JointVenture sections

super ultra big merge completed. scope of work clearly defined. let's go build!

Assisted-by: GLM-5 via Crush <crush@charm.land>

pages/126.Handbook.SourceMaterial.people.team-structure._team_template/default.md

@@ -0,0 +1,28 @@
+---
+title: 'People'
+menu: 'People'
+---
+
+---
+title: Team Example
+sidebar: Handbook
+showTitle: true
+hideAnchor: true
+---
+
+## People
+
+- [Jane Doe (Team Lead, Full Stack Engineer)](/handbook/company/team/#jane-doe-software-engineer)
+- [Max Mustermann (Full Stack Engineer)](/handbook/company/team/#max-mustermann-software-engineer)
+
+## Mission
+
+## Responsibilities
+
+## Customer
+
+## Output metrics
+
+## Slack channel
+
+[#team-example](https://posthog.slack.com/messages/team-example)