feat(seo): per-route titles + meta descriptions; ci: honest runner test

Every page previously titled 'Corrosion Management' with zero meta -
marketing invisible to search and link previews. Router afterEach now
sets title/description/og per route (no new deps); marketing pages get
real content-backed descriptions, panel views mechanical titles.
index.html carries defaults for pre-JS crawlers. Verified in-browser
per page via Playwright.

test-runner.yml: per-tool presence checks instead of green-lighting
missing toolchains; workflow_dispatch instead of every push.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/test-runner.yml

@@ -1,5 +1,6 @@
 name: Test Asgard Runner
-on: [push]
+# On-demand only — no reason to spin a container on every push.
+on: [workflow_dispatch]
 
 jobs:
   test:
@@ -17,8 +18,15 @@ jobs:
           echo "Memory: $(free -h | grep Mem | awk '{print $2}')"
           echo "Disk: $(df -h / | tail -1 | awk '{print $4}')"
           echo "==========================================="
-          echo "Go: $(go version)"
-          echo "Rust: $(rustc --version)"
-          echo "Docker: $(docker --version)"
+          # Jobs run in a bare node:20-bullseye container: toolchains are NOT
+          # preinstalled — workflows must bootstrap them (setup-go, rustup).
+          # Report presence honestly instead of green-lighting a missing tool.
+          for tool in go rustc docker node; do
+            if command -v "$tool" >/dev/null 2>&1; then
+              echo "$tool: $($tool --version 2>&1 | head -1)"
+            else
+              echo "$tool: NOT PRESENT (workflows must install per-run)"
+            fi
+          done
           echo "==========================================="
-          echo "✅ Asgard runner is OPERATIONAL"
+          echo "✅ Asgard runner reachable — container is node:20-bullseye, bootstrap toolchains per-run"