Two Codex bot findings from earlier PR reviews were still open.
1. local:// URL selector shadow (read.ts): the local:// branch resolved
`local://foo:1-2` and rewrote readPath to `${localFile.path}:${sel}`,
then let splitPathAndSelPreferringLiteral run on the synthesized
string. A sibling literal `${localFile.path}:${sel}` file would win
over the intended URL selector semantics. The branch now promotes the
URL selector into the explicit-selector state and sets
readPath = localFile.path, so downstream literal-preferring routing
never re-splits the concatenation.
2. Delimited expansion before literal probe (path-utils.ts): grep called
expandDelimitedPathEntries before parsePathSpecs, and
splitDelimitedPathEntry only checked whether the peeled base of the
entry resolved. A real POSIX file whose name contained a delimiter
plus a selector-shaped tail (a;b:1-2) got split into ["a", "b:1-2"]
and never reached the literal-preferring probe. splitDelimitedPathEntry
now short-circuits on probeLiteralPathExists — "missing" is the only
outcome that lets delimiter expansion run.
Added regressions: `read local://notes.md:1-2` still slices the base file
when a sibling `notes.md:1-2` literal exists, and grep searches a real
`a;b:1-2` file without semicolon-splitting.
roboomp
a2e055fa9c