login: ecore's cookie decoder, which validates the name ours did not

authz/identity.go was the fifth copy of a decode the instance has one of,
and it was one of the two that validated nothing: whatever name a sealed
payload carried went on to the GraphQL viewer field, the chrome's nav and
every log line the request produced. login.ValidName refuses it, and
there is no spelling of the API that turns the check off.

Gone with it: CookieName, UsernameFromRequest, Middleware, ForContext and
the ctxKey, plus identity_test.go, whose round-trip, tilde-stripping and
garbage-cookie cases are ecore's tests now. The Middleware becomes
login.Optional() — this service refuses nobody, git.sr.ht decides what an
anonymous viewer may see — and the default validator is kept rather than
core.ValidOwner, which is lowercase-only and would log a real account out
of compare alone.

The one behaviour change a viewer could notice: a cookie whose name
carries a '/', a control byte or a non-ASCII letter now reads as
anonymous instead of as that name.

docs: spec for inline code comments on diffs

Draft proposal for line-anchored comment threads on the commit and compare
pages. Records the key finding that storage is already available through
sr-ht-core (Postgres via the database package + connection-string), that the
service is stateless by choice rather than by limitation, and that @pierre/diffs
already provides the thread UI primitives (DiffLineAnnotation + renderAnnotation
+ onDiffLineClick). Covers the anchoring model, schema, authz reuse, HTTP API,
frontend wiring, config, and a commit-first phasing.