report-of resolves names differently from the observer predicates across function scope

[InauguralPhysicist]

Minimal repro (v0.25.0 + #382):

# mod.eigs
g is 0.0
define feedg(v) as:
    g is v + 0.0
define readg() as:
    return report of g
define stableg() as:
    return stable of g

Load it, feed g a nonzero constant 14 times, then:

• stableg of [] → 1 — stable of g inside the function resolves the module global's Env slot and sees the trajectory.
• readg of [] → "equilibrium" — report of g inside the same function falls through to the no-binding builtin path (builtins.c's builtin_report, the Observer dH-window lost when a residual is built via temps that NUM_REUSE-alias the convergence variable #262 value-based fallback), as if g had no slot.

So the REPORT_NAME/REPORT_SLOT compile path and the predicate-of-name path disagree about name resolution across a function boundary. Whichever is intended, they should agree; today a slot-dispatch helper can expose stable of/diverging of verdicts but not report of ones (found building lib/observer_slots.eigs — its verdict() API is dropped until this is resolved).

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