docs: sync site for simply-flow and fix stale orchestrator README

[ClayChipps]

Summary

Documentation audit after the last two PRs (#131 AT4DX create/set, #133 flow/permissions cleanup),
requested to make sure everything is current — including the static docs site, which turned out to
need more than expected.

• Registered simply-flow with the docs site. The site does not auto-discover new packages —
  site/scripts/sync-command-reference.mjs's plugin list and site/astro.config.mjs's sidebar both
  needed a manual entry, plus the plugins overview page and getting-started.md's install list.
• Fixed a pre-existing gap: getting-started.md's install list was missing simply-aep entirely
  (unrelated to this round of work, just found while auditing the same file).
• Regenerated packages/simply/README.md, which was badly stale — missing entire plugins' worth
  of commands (simply-aep, simply-sobject, simply-community url set, and more), not just the
  recent Flow/AT4DX create/set additions. Unlike command-snapshot.json, this file has no
  automatic regeneration step, and nobody had run pnpm run readme there in a while.
• Re-synced every site command-reference page from the now-correct package READMEs. This picked
  up drift going back to at least PR feat: add domain-process-binding create/set commands #131 — the AT4DX create/set commands were never synced to the
  site's tracked .md files (the deployed site was never wrong, since docs.yml re-syncs before
  every build, but the repo's own copies had drifted).
• Marked design docs 0012 and 0013 Implemented with their PR numbers, and updated the design doc
  index.
• Corrected CLAUDE.md's docs-site guidance, which overstated the automation — it didn't mention
  that a brand-new package needs manual site registration, or that the tracked site/ source files
  don't self-update just because the deployed site does.

Test plan

• pnpm --filter site run sync && pnpm --filter site run build — clean build, 33 pages, including
  the new /plugins/simply-flow/ page
• Root pnpm run build/pnpm test across all 16 projects passes (ran as part of the pre-push
  hook; one transient npmjs.com rate-limit (HTTP 429) during simply-cicd's link-check on the
  first attempt, unrelated to any change here, resolved on retry)
• N/A — no source code changes

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