- whole porch track (2-8) now brainstormed and locked (all ready)
- four decisions: three hooks (on-listen/on-shutdown/on-route-registered);
healthcheck ships BOTH /livez + /readyz; directory listing off-by-default,
documented; Last-Modified via a new small time.utc(ms)->TimeParts builtin
- language enhancement: YES, one small builtin -- time.utc, a gmtime sibling
of time.local (time.local is local-tz, time.iso is UTC-but-ISO); IMS by
string-equality, no date parser. The track's third + smallest language touch
- byte ranges/large files via fs.read_at + iteration 6 writer; not lang-41-exposed
- track language bill now explicit: random_bytes (2), deflate+crc32 (7),
time.utc (8) -- each a builtin with a named consumer, none decoration
- validated against .dev/reference/fiber. Board: whole track marked ready
(cherry picked from commit 9801fceade799e25718606177f09e4306a579e98)