[BUG] zsh completion: top-level flags (--continue, --session, --fork) never suggested by tab completion

Summary

Top-level (root) flags of the opencode command are never suggested by shell tab completion. Completing opencode <TAB> lists subcommands but no --option flags.

Expected behavior

Typing opencode --<TAB> (or opencode <TAB> showing both commands and flags) should suggest all valid top-level flags, including --continue, --session, and --fork.

Actual behavior

opencode --get-yargs-completions opencode --co (and --cont) returns only:

--help
--version
--print-logs
--log-level
--pure

Flags like --continue, --session, and --fork are valid (confirmed via opencode --help: -c, --continue, -s, --session, --fork), but are never surfaced by the completion script.

Reproduction

# Install completion
opencode completion > /usr/share/zsh/site-functions/_opencode

# In zsh:
opencode --co<TAB>   # suggests --help, --version, --print-logs, --log-level, --pure
opencode <TAB>       # lists subcommands only, no flags

The completion script is a thin wrapper that calls opencode --get-yargs-completions at runtime, so this is a bug in the yargs completion generation (--get-yargs-completions), not in the installed completion file. The installed file is byte-identical to the current opencode completion output.

Environment

• opencode binary: /usr/bin/opencode
• shell: zsh
• completion installed via opencode completion to /usr/share/zsh/site-functions/_opencode