Add Infrastructure Planning Policy, Database Guidelines, and Terraform Style Guide

[github-actions]

1. Target

• Closes Add Infrastructure Planning Policy, Database Guidelines, and Terraform Style Guide #88

2. Specification / Test Plan

Adds an infrastructure planning policy and two supporting guideline pages to the
handbook, grounded in big-tech decision frameworks (AWS / Azure / Google
Well-Architected, Google SRE, DORA, The Twelve-Factor App, OWASP / CIS / NIST)
and right-sized for an SME. All external references were fetched and verified
live.

Pages added:

• doc/infra-planning-policy.md (Policies) — 12 guiding principles: scale to
  zero, Zero Trust, IaC mandatory, one-tool-owns-each-resource, reliability &
  delivery measured, observability, environments & promotion, backups & DR,
  secrets & least-privilege, deploy safely & reversibly, cost as a design
  constraint, managed-over-self-hosted — plus grouped references.
• doc/database-guidelines.md (Guideline → Development Guide) — choosing a data
  store (SQL vs NoSQL) and structuring relational schemas, including OSBR's SQL
  house style.
• doc/style-guide-terraform.md (Style Guide) — Terraform / OpenTofu coding
  conventions (RFC 2119 levels, industry 🌎 / house 🏠 tags).

Wiring:

• doc/.vitepress/config.mts — sidebar entries: Infrastructure Planning Policy
  under Policies, Database Guidelines nested under Development Guide, Terraform
  under Style Guide.
• doc/development-guide.md and doc/style-guide.md — link the new pages from
  the Development Guide and Style Guide indexes.

Test plan:

• pnpm docs:build passes — 18 markdown files including the 3 new pages, no
  build errors. VitePress fails the build on dead links, so a clean build
  confirms every internal cross-link resolves.
• node --check doc/.vitepress/config.mts passes.
• Rendered pages and sidebar nesting verified via pnpm docs:preview (see §5).

3. Additional Instructions / Notes for Shipping (optional)

N/A

4. Check before Review Request

• Self Review : I reviewed changes by myself and approved them.
  • Ensure there is no sensitive information, typos, unrelated changes, or debugging code.
• Evidence : I attached evidences to prove the changes.
  • Record and attach a demo video. For minor changes, attaching an image is also acceptable.
  • Evidences should be updated to the latest version when further changes are made.

5. Evidence

Verification:

• pnpm docs:build → build complete with no dead-link or build errors; all 18
  markdown files (including the 3 new pages) rendered.
• Rendered-page screenshots captured from pnpm docs:preview for the three new
  pages (Infrastructure Planning Policy, Database Guidelines, Terraform Style
  Guide), showing the pages render and the sidebar nesting is correct
  (Infrastructure Planning Policy under Policies; Database Guidelines under
  Development Guide; Terraform under Style Guide).

[sn0wm1ku]

Status check on this assigned PR: the branch is empty — but the implementation already exists locally.

• This PR's branch i88-20260713-1954 contains only the bot placeholder commit (000d3ea, 0 file changes), so nothing of Add Infrastructure Planning Policy, Database Guidelines, and Terraform Style Guide #88's spec is reviewable here yet.
• The full implementation is committed but unpushed in the local clone: branch worktree-infra-planning-policy, commit d73577c (4 files, +434/−1: doc/infra-planning-policy.md, doc/database-guidelines.md, doc/style-guide-terraform.md, and the config.mts sidebar entries).
• Its parent (b454758) is already on main via Generate an LLM-friendly version of the handbook (llms.txt) #86, so it applies cleanly onto this PR branch — no rebase needed.

Next step is captured as a ticket (no re-implementation — just land the existing commit here, then fill the PR template + evidence):

• Ticket: .workaholic/tickets/todo/sn0wm1ku/20260713200257-push-infra-planning-docs-to-pr-89.md on branch ghduty/ticket-i88-land-infra-planning-docs

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_{🤖 auto-posted by sn0wm1ku/ghDuty · co-authored by Claude (claude-opus-4-8)}

[sn0wm1ku]

Approving: infrastructure planning policy plus database and Terraform guidelines. Verified pnpm docs:build passes with no dead-link or build errors (all internal cross-links resolve), and the three new pages render with correct sidebar nesting (Infrastructure Planning Policy under Policies, Database Guidelines under Development Guide, Terraform under Style Guide) via docs:preview. Additive documentation, no runtime surface.