fix(cli): suggest no longer aborts with empty output under strict set -e

[Chosen9115]

What & why

A user reported that on their (Linux) box the CLI test suite exits non-zero at the local suggest section, and reproduced it directly:

opensop suggest "qualify sales lead by email" --local --json
# exits 1, empty output

Root cause. The threshold-parse loop in both local_suggest and cmd_suggest used (( i++ )). A standalone (( i++ )) returns exit status 1 when i is 0 — the post-increment evaluates to the old value 0, and ((…)) reports a zero result as "false". Under set -euo pipefail, on bashes that abort on arithmetic-evaluating-to-zero (common on Linux; Apple's bash 3.2 happens not to), this killed suggest on the very first loop iteration, before any output — hence "exit 1, empty stdout".

search was unaffected because local_search has no such loop. That asymmetry is exactly what the reporter saw: a no-match search passed, then suggest failed in the same run.

The fix replaces both (( i++ )) with the assignment form i=$((i + 1)), which always returns exit status 0.

Changes

• cli/bin/opensop — (( i++ )) → i=$((i + 1)) in local_suggest (the reported --local path) and cmd_suggest (the remote path; identical latent bug from the mirrored implementation).
• cli/test/test.sh — source-level guard forbidding standalone (( var++ )) / (( var-- )). A behavioral test passes on a non-aborting bash and gives false confidence; this guard is portable and catches the whole footgun class.
• cli/CHANGELOG.md — [Unreleased] → Fixed entry.

Test plan

• bash -n cli/bin/opensop — clean.
• bash cli/test/test.sh — ALL PASS (exit 0), including the new guard and all suggest --local cases.
• Reproduced the abort under an emulated strict-set -e bash (treating the arithmetic command's rc=1 as fatal) and confirmed the assignment form survives where (( i++ )) aborted.

Self-rating

• Correctness 9 · simplicity 9 · test coverage 8 (portable source-guard + existing behavioral coverage) · naming 9 · spec fidelity 10 (no contract change) · public-repo hygiene 10 (no PII/secrets/internal identifiers).

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