Codex re-check: degenerate URIs still leaked — gpt://folder123 returned the
authority, gpt://folder123/${MODEL} returned the placeholder. Removed the _all[0]
authority fallback and guarded the literal-last-path fallback against placeholders;
a URI with no usable model segment now falls back to the raw id. Added regression
cases for gpt://folder123 and gpt://folder123/${MODEL}.
Codex gate found two edges in the first cut: (1) the candidate segment list
included the URI authority, so gpt://folder123/v4 and .../latest returned the
folder; (2) _isVersionTail matched any digit-leading segment, dropping a real
model named 2026-model. Fix: build path segments from AFTER the authority only;
tighten the version-tail regex to pure version tokens (latest/stable/v4/1.2),
not mixed names; fall back to last-usable (non-placeholder) path segment so the
authority is never returned. Added edge-case regression tests.
#3366 changed getModelLabel() to strip only the first /-segment (fixing #3360
multi-slash proxy IDs). That regressed URI-scheme IDs like Yandex
gpt://${FOLDER}/deepseek-v4-flash/latest — indexOf('/') lands inside the ://
and leaves /${FOLDER}/... path junk in the composer model chip. Detect a
scheme:// id, drop scheme+authority, and take the last meaningful path segment
(skipping ${...} env-var placeholders and bare version tails like latest).
Non-URI multi-slash IDs keep the #3360 first-segment-strip behavior unchanged.
Node-driven regression test covers the URI case + the #3360 non-regression.
