Ambient ocean: jellyfish reads as a blob-on-a-string — single tentacle, needs a real silhouette

[Hmbown]

Dogfood evidence (2026-07-24): the ambient jellyfish currently renders as JELLY_BELL = "o*" plus a single width-1 tentacle cycling ["|", ":", "|", "."] (crates/tui/src/tui/ambient_life.rs). A circle + * + one | does not read as a jellyfish — it reads as a parenthetical blob on a string.

Jellyfish have multiple tentacles. Redesign the sprite so the bell dome and 2–3 lagging tentacle columns sway out of phase, keeping:

• the existing pulse/lag timing model (JELLY_PULSE_MS, JELLY_TENTACLE_LAG_MS) — extend per-tentacle phase offsets
• the ASCII-safe / low-motion tiers (each tier gets a silhouette that still reads)
• width handling in the draw loop (bell is no longer width-2/1 — update the area.width clamp and per-column drawing)
• brightness floors and depth ordering unchanged

Add unit tests asserting the frame tables (widths, tentacle count ≥ 2, phase offsets differ per tentacle) and extend water_holds_only_fish_bubbles_and_jellyfish-style coverage if the glyph set changes.

Surfaced by Hunter while dogfooding v0.9.2.

[Hmbown]

Moved to the v0.9.3 milestone as part of a v0.9.2 scope pass.

Why: this is a design/exploration program, not an implementable acceptance slice. It describes a visual direction to investigate rather than a behavior with a testable done-condition, so no agent or contributor can close it against a definition of done — it needs a design decision first.

This is a scheduling call, not a rejection or a downgrade — the issue is unchanged and keeps its labels. v0.9.2 was carrying 61 open issues while its actually-shippable work had landed; leaving items on a release milestone they were never going to make hides what is really left and makes the count useless for deciding when to cut.