tests/interaction: backfill note= on transport-restricted requirements

89 entries with transports= but no note= now carry a one-line note
explaining why the behaviour is transport-specific (the other 38
transport-restricted entries gained note= in the removed_in pass).
Notes follow consistent per-prefix templates: OAuth is HTTP-only;
HTTP status codes / headers / SSE stream lifecycle are HTTP-only;
stderr/signals are stdio-only.

test_coverage.py gains test_transport_restriction_has_note: every
entry with transports= must carry note=.

504 connect cells unchanged; 100% coverage; pyright/ruff clean.

Author: maxisbey