Do not consume json-envelope when it is an option value

[Widthdom]

Summary

The global JSON-envelope preprocessor consumes a separated option value when that value is the literal --json-envelope. This corrupts the remaining argument positions before command-specific parsing.

Reproduced with locally built cdidx v1.40.3 from origin/main at 2a1313b87ed361bbabe78eba848b6352cecd3dd0.

Reproduction

$ cdidx search --query --json-envelope --db .cdidx/codeindex.db --json=array
Error: unexpected extra positional 1 argument for search: `.cdidx/codeindex.db`.

The equivalent inline value is not consumed and works:

$ cdidx search --query=--json-envelope --db .cdidx/codeindex.db --count
78

Existing issue relationship

No exact open issue was found.

Expected behavior and scope

Global-option preprocessing must classify token roles before consuming --json-envelope. A token used as the separated value of --query or another value-taking option must remain command data, while an actual global --json-envelope option must keep its current behavior.

Cover separated and inline values, option ordering, the positional -- query form, other value-taking options whose values may equal a global flag, and normal envelope output.