[josephchimebuka]

Closes #509
Closes #503
Closes #502
Closes #496

• Create Architecture Decision Records (ADRs) #509 – Adds docs/architecture/decisions/ with an index, a template, and six ADRs (component pattern, per-merchant account, fee time-lock, two-step admin transfer, separate factories, and the two subscription systems). The rule for when an ADR is required is added to CONTRIBUTING.md.
• Add Documentation Quality Checks to CI #503 – Adds .github/workflows/docs-quality.yml, which runs lychee, markdownlint-cli2, and typos on PRs that touch Markdown. Configs: lychee.toml, .markdownlint-cli2.jsonc, _typos.toml. Local instructions are in docs/contributing/docs-tooling.md.
• Set Up the Documentation Site Build and Publishing #502 – Adds an mdBook site (docs/book.toml, docs/SUMMARY.md) with search, Mermaid, and edit links. Rustdoc is published under /api/. .github/workflows/docs.yml builds the site on PRs and deploys it to GitHub Pages on main. Adds make docs, make docs-serve, and make docs-check.
• Document Time, Ledger Timestamps, and Interval Semantics #496 – Adds docs/concepts/time-and-intervals.md.

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