vision: port weave as z1 overlay (never a fourth tab)

[Zychs]

Vision

Time is a weave overlay, not a base view / fourth tab (docs/ARCHITECTURE.md § time-as-layer resolution; ~8 explorations that stalled on the wrong model).

Reality

src/lenses/weave.js is a STUB (throws / no real logic). Port sources live in index.html / harvest per ARCHITECTURE / CATALOG.

Requirements

• Overlay composited above the active base lens (spatial or radial).
• Never promoted to a tab equal to base lenses.
• Scrub_t remains the playhead (snapshot.js).

Exit

Weave live in shell.html as overlay; ARCHITECTURE status WIRED for overlay path.

Refs

Phase E · ARCHITECTURE time-as-weave · CATALOG port map