Flip default_tool from `mdedit` to `browse` (which now ships a Toast UI
markdown editor plugin in its preview pane) at:
• paths."*".paths.working
• paths."*".paths.working.paths."*" (per-user homes)
• paths."*".paths.reviewing
available_tools at those levels drops `mdedit` and adds `browse` next
to `classifier`. Operator overrides per .zddc cascade still work; only
the embedded baseline changes.
Test fixtures updated:
• lookups_test.go — DefaultToolAt assertions for working/+reviewing/
• availability_test.go — AppAvailableAt + DefaultAppAt for working/+
reviewing/+per-user home
• main_test.go — dispatch route asserts "ZDDC Browse" (was "ZDDC
Markdown"); Apps cascade fixture swaps mdedit
for browse so the live route fetches the right
embedded HTML
ZDDC
7fbe7867fd