add Instant + Duration as first-class types in El

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Postfix literal syntax (30.seconds, 1.hour). Type-checked arithmetic
(Instant + Duration -> Instant; Instant + Instant fails). TTL helpers
backed by typed Duration. sleep(Duration) replaces ambiguous sleep(Int).

Self-host fixed point holds at 5797 lines.
Snapshot tagged at dist/platform/elc.20260502-1256-self-host.

Phase 2 (every/after/at scheduling primitives) lands separately.
Backlog: bl-937e9c30

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This commit is contained in:

Will Anderson

2026-05-02 12:57:13 -05:00

parent af480f6266

commit e7c2fd02df

10 changed files with 280 additions and 0 deletions

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