Plan checker iteration 1 flagged unresolved research questions and a
missing decision note for golang.org/x/net/html. D-18 approves x/net/html
for the partial sanitizer; D-19 fixes the Discogs widget fill to
[year, format]. STATE marks the phase ready to execute.
Four plans: framework Go contracts and routes, framework SPA hosts,
Albums proof in fonoteka.go, and unit tests with the phase gate.
Adds ADMIN-07 to REQUIREMENTS.md and fills the Phase 10.1 roadmap goal,
success criteria and plan list.
