Per review on PR #48: pre-1.0 there is no installed base to keep
compiling against, so remove the dead parameter in one pass instead of
deferring. NewManager now takes only the signing key. Update the
handlers.go call site and its stale comment, mechanically update the
NewManager call shapes in the session tests (assertions unchanged),
collapse the now-meaningless constructor-argument loop in the cookie
attributes test, and drop the moot P1 Future Step from TODO.md.
Reviewer-directed test call-site updates; cookie behavior is unchanged
from the previous commit (always Secure/HttpOnly/SameSite=Strict).
Add a failing test asserting that every cookie written by the session
manager (both the CreateSession set-cookie path and the ClearSession
delete-cookie path) carries HttpOnly, Secure, and a SameSite mode of
Lax or stricter, regardless of constructor arguments. Session cookies
carry authentication state and must never be sent over plaintext HTTP.
Currently fails for the constructor secure=false case, which produces
cookies without the Secure attribute (gosec G124 at
internal/session/session.go:84 and :128).
