Closes #433

Summary

S0 IA-reconciliation (hard precursor for all #401 C/D docs authoring), per proposal §2.2:

• All 15 docs/site/capabilities/*.md pages moved content-as-is into their target pillar folders; each old page replaced by a redirect document (layouts/redirect.vto, new) pointing at the canonical pillar path.
• Every comp.xref cap:* key retargeted to the new pillar paths (_data/xref.ts); _data.ts "Overview & Concepts" cards on the 3 rerouted pillars now point in-pillar.
• Two net-new navigable stubs: orchestration-runtime/cli-scaffold.md, ai/mcp.md (for workstream D to fill).
• capabilities/index.md replaced by a redirect after the per-page redirects.

Non-goals honored: no prose rewrites, tutorial-chapter nav anchors untouched, no packages//plugins/ file, no deno.lock churn.

Evidence (worklog: .llm/runs/docs-433-ia-reconcile--codex/worklog.md)

• deno task verify in docs/site: exit 0 — 23,016 internal links across 162 pages resolve; 27 caveat markers resolve.
• Built-output redirect inspection: all 15 legacy URLs carry their mapped canonical target (redirects=15 PASS).
• rg 'capabilities/' docs/site/_data.ts docs/site/_data/xref.ts: clean; 9 pillar headings unchanged in count/order.

CI routing

Docs-only diff (docs/site + run artifacts): applying ci:skip-e2e + ci:skip-scaffold per the harness docs-only rule — the aspire/docker scaffold surface is untouched.

Lane: WSL Codex slice (thread 019f5118-72af…, worktree ns-wt-433) under the beta-7 orchestrator (df71d36c).