forge-webspec walks the signed-in pages too: /map, /system, /boards, /crew, a pull, settings

Part of #2915 (specification.website in CI). test/forge-webspec.test.ts walks only signed-out PATHS, with an empty KNOWN.

Done:

[ ] A second test signs in as the owner and runs webspec() over /map, /system, /boards, /crew, a pull page and /settings.
[ ] Every finding today is named in its own KNOWN with section and why; a new one fails, and a fixed one must leave KNOWN.
[ ] Under the per-file budget (one forge per file).

Files: test/forge-webspec.test.ts only. Risk: authenticated pages are no-store; do not assert on caching headers they deliberately lack.

forge-webspec walks the signed-in pages too: /map, /system, /boards, /crew, a pull, settings #3170