created wiki user docs for this project

[lcorrigan704]

Summary

• Added a full repo-first GitHub Wiki documentation system for end users/operators.
• Documented all current app workflows, including multi-workspace behavior, tax, multi-entity emails, adjustments, backups, and danger-zone flows.
• Added tooling to validate docs quality and sync repo markdown to the GitHub Wiki repo.

Changes

• Added wiki source-of-truth under docs/wiki/:
  • Core pages: Home, Getting Started, Navigation + FY filter, Onboarding/Auth.
  • Feature pages: Workspaces, Clients, Invoices, Quotes, Revenue Adjustments, Service Agreements, Proposals, Expenses.
  • Operations pages: Emails Workspace, Tax Workspace, Settings, Danger Zone.
  • Support pages: Troubleshooting/FAQ, Operations Runbook.
  • Governance pages: Documentation Standards, Docs Freshness.
• Added templates:
  • docs/wiki/_templates/task-guide.md
  • docs/wiki/_templates/reference.md
• Added nav manifest:
  • docs/wiki/nav.json
• Added generated index:
  • docs/wiki/INDEX.md
• Added docs workflow readme:
  • docs/wiki/README.md
• Added wiki asset conventions:
  • docs/wiki/assets/README.md
• Added scripts:
  • scripts/wiki-build-index.sh (generate index from nav)
  • scripts/wiki-validate.sh (required sections + local link checks; rg/grep compatible)
  • scripts/wiki-sync.sh (dry-run/sync/push to wiki repo; generates _Sidebar.md)
• Added CI workflow:
  • .github/workflows/wiki-docs-check.yml
• Updated PR template checklist to enforce docs hygiene:
  • .github/pull_request_template.md

Validation

• Ran:
  • bash scripts/wiki-build-index.sh
  • bash scripts/wiki-validate.sh
  • bash scripts/wiki-sync.sh --dry-run
• Result:
  • Docs validation passed.
  • Wiki sync dry-run passed and listed expected pages/assets/sidebar output.

Screenshots (if UI changes)

• No application UI changes in this PR.
• Documentation-only change.

Risks / Notes

• Wiki publishing requires the GitHub Wiki repo to be enabled and initialized.
• Sync script expects a local clone of the wiki repo path passed via --wiki-dir.

Checklist

• I have tested these changes locally
• I have updated documentation where needed
• I reviewed docs impact and updated impacted pages under docs/wiki/
• I updated docs/wiki/Docs-Freshness.md (or marked N/A with reason)
• I ran bash scripts/wiki-validate.sh locally (or CI covers this)
• I have considered migrations or data impacts (N/A - docs/tooling only)