#3118 extension push: a required global argument renders with a stray "" ("text": "string""")

swamp extension push (seen on 20261006.221608.0-sha.5c0c6532) prints each model global argument through a structured-log template that interpolates the optional suffix. For a required argument the suffix is the empty string, and the logger renders it quoted:

[INF] extension·push:     Global Arguments:
[INF] extension·push:       "text": "string"""

Expected

[INF] extension·push:       "text": "string"

and "text": "string" (optional) for an optional one.

Where

src/presentation/renderers/extension_push.ts around line 181-182: const opt = arg.required ? "" : " (optional)" interpolated as ${opt} in a logger template literal. Build the line without interpolating an empty value, or log the optional marker as plain text.

Reproduce

The text-entropy model from the manual tutorial (a single required z.string() global argument): swamp extension push extensions/models/manifest.yaml --dry-run.

Found while capturing manual samples for Lab #3071.