ontoref — Nushell 0.111 String Interpolation Compatibility Fix

Context

Nushell 0.111 introduced a breaking change in string interpolation parsing: expressions inside `$"..."` that match the pattern `(identifier: expr)` are now parsed as command calls rather than as record literals or literal text. This broke four print statements in reflection/bin/ontoref.nu that used patterns like `(kind: ($kind))`, `(logo: ($logo_file))`, `(parents: ($parent_slugs))`, and `(POST /actors/register)`. The bug manifested when running `ontoref setup` and `ontoref hooks-install` on any consumer project using Nu 0.111+. The minimum Nu version gate (>= 0.110.0) did not catch 0.111 regressions since it only guards the lower bound.

Decision

Fix all four affected print statements by removing the outer parentheses from label-value pairs inside string interpolations, or by removing the `$` prefix from strings that contain no variable interpolation. The fix is minimal and non-semantic: `(kind: ($kind))` becomes `kind: ($kind)` (literal label + variable), and `$"(POST /actors/register)"` becomes `"(POST /actors/register)"` (plain string). The fix is applied to both the dev repo (reflection/bin/ontoref.nu) and the installed copy (~/.local/bin/ontoref via just install-daemon). The minimum version gate remains >= 0.110.0 but 0.111 is now the tested floor.

Constraints

Hard String interpolations in ontoref.nu must not use `(identifier: expr)` patterns — use bare `identifier: (expr)` instead
Soft Print statements with no variable interpolation must use plain strings, not `$"..."`

Alternatives considered

Raise minimum Nu version to 0.111 and document the breaking change — rejected: Does not fix the broken syntax — just makes the breakage explicit. Consumer projects already on 0.111 would still fail until the print statements are fixed.
Use escape sequences or string concatenation to embed literal parens — rejected: Nushell has no escape for parens in string interpolation. String concatenation (e.g. `'(kind: ' + $kind + ')'`) works but is significantly less readable than bare `kind: ($kind)`.