Time as a materialized view over observations

[flyingrobots]

Salvaged from old Continuum crates/jitos-views/src/clock.rs, preserved only in git history (formerly listed in GoodIdeas.md, now deleted).

Idea: time is a materialized view over observations, not a syscall.

• wall clock does not belong in substrate truth
• time beliefs should carry provenance
• policy chooses how observations become "now"

Scope: Echo / git-warp runtime-internal concern, not a Continuum-owned contract. Filed here to preserve the idea before deleting the salvage note; move it to the owning runtime repo when picked up.

[flyingrobots]

Re-homing to Echo: time-as-observation policy belongs in runtime semantics, not in Continuum as a protocol tracker item.