feat(phase3): mcp.md canonical from AEGIS wiki

Phase 3 of the wiki-as-SoT migration (AEGIS wiki slug
`wiki-as-docs-sot-migration`). The HTTP wiki proxy endpoint
(`aegis#582`) shipped in aegis-daemon v2.10.6, so
docs-sync-from-wiki.sh is now CI-runnable end-to-end.

Changes:
- scripts/wiki-publish-manifest.json: flip
  mcp-gateway-architecture from POC slot (mcp-from-wiki.md) to
  canonical (mcp.md). Updated _note accordingly.
- docs-manifest.json: drop the legacy stackbilt-web/docs/mcp.md
  entry. mcp.md is now wiki-sourced; the gh-API path no longer
  produces a file at this slot.
- scripts/docs-sync-from-wiki.sh: parser tolerates either
  response shape — `{ page: { ... } }` (original aegis#582 spec)
  or `{ ... }` directly (what aegis-daemon v2.10.6 actually
  returns). Discrepancy noted; not blocking.
- src/content/docs/mcp.md: regenerated from wiki via the now-live
  HTTP path. Carries lastVerified + sourceSlug provenance.
- src/content/docs/mcp-from-wiki.md: retired POC slot.

Verified locally: `npm run build` produces clean /mcp/ page
with wiki content (43.6KB). /mcp-from-wiki/ no longer routes.

Per the migration plan, Phase 4 will batch the remaining
candidates (evidence-engine-*, consult-harness-*, trust-*).

Author: Kurt Overmier

docs-manifest.json

@@ -27,13 +27,6 @@
           "color": "#f472b6",
           "tag": "04"
         },
-        "mcp.md": {
-          "source": "docs/mcp.md",
-          "section": "platform",
-          "order": 5,
-          "color": "#22d3ee",
-          "tag": "05"
-        },
         "api-reference.md": {
           "source": "docs/api-reference.md",
           "section": "platform",

scripts/docs-sync-from-wiki.sh

@@ -103,11 +103,14 @@ while IFS=$'\t' read -r slug page section order color tag; do
     continue
   fi
 
-  # Parse JSON: extract title, summary, body, last_verified
+  # Parse JSON: extract title, summary, body, last_verified.
+  # Tolerate either response shape:
+  #   { page: { title, ... } }  — original aegis#582 spec
+  #   { title, ... }             — aegis-daemon v2.10.6 actually returns the page directly
   parsed=$(echo "$body" | python3 -c "
 import json, sys
 data = json.load(sys.stdin)
-page = data.get('page', {})
+page = data.get('page', data) if isinstance(data, dict) else {}
 print('---TITLE---')
 print(page.get('title', ''))
 print('---SUMMARY---')

scripts/wiki-publish-manifest.json

@@ -2,13 +2,13 @@
   "$schema": "Phase 2 wiki-as-SoT publish manifest — AEGIS wiki slugs → Astro page metadata. Per wiki-as-docs-sot-migration AEGIS decision.",
   "version": 4,
   "contentDir": "src/content/docs",
-  "_note": "Phase 2 parallel: page filenames are explicit per entry and use a -from-wiki suffix so they land at top-level (e.g., mcp-from-wiki.md) and route at /mcp-from-wiki for side-by-side comparison with the legacy /mcp page. Astro treats __-prefixed dirs as private and skips them, which is why we don't put files in a __from-wiki/ subdir. After Phase 4 migration (legacy retired), drop the suffix and use the actual page filename.",
+  "_note": "Phase 3: mcp-gateway-architecture is now canonical (page: mcp.md). The corresponding entry was removed from legacy docs-manifest.json and the parallel POC slot mcp-from-wiki.md was retired. Remaining migration candidates land here per wiki-as-docs-sot-migration.",
   "source": "aegis-wiki",
   "aegisBase": "https://aegis.stackbilt.dev",
   "pages": [
     {
       "slug": "mcp-gateway-architecture",
-      "page": "mcp-from-wiki.md",
+      "page": "mcp.md",
       "section": "platform",
       "order": 5,
       "color": "#22d3ee",