fix(cli): remove eval export option

[christso]

Summary

agentv eval now has one results boundary: the --output run directory and its index.jsonl manifest. The removed --export path no longer appears in help or parsing, and former flat-format writers are gone so JSONL/benchmark/timing/transcript/per-test artifacts remain the only eval-run artifact contract.

Consumer research

• Repo-local search found --export only in AgentV docs, tests, helper scripts, and the eval CI workflow; all were migrated to --output / index.jsonl or removed.
• GitHub code search for "agentv eval" "--export", "agentv eval run" "--export", and WiseTechGlobal/EntityProcess scoped variants returned no external hits.
• gh repo view WiseTechGlobal/sdd confirmed the repo is private; downloaded the accessible zipball and searched it directly. The only agentv eval usages were .github/workflows/sdd-eval.yml and evals/e2e/scripts/check-v2-suite.test.cjs, and neither used --export.

Behavior changes

• agentv eval run --help no longer advertises --export.
• Passing --export is rejected by the CLI parser as an unknown argument.
• Helper scripts that previously copied flat result files now read or copy <run>/index.jsonl from the canonical run folder.
• The CI eval workflow now uploads the run folder and summary without trying to publish JUnit XML from agentv eval.

Red/green CLI evidence

Scenario	Before	After
Help output	agentv eval run --help listed --export <str>	no --export option in help
--export invocation	dry-run accepted --export /tmp/.../results.jsonl and wrote the flat file	exits 1 with Unknown arguments
Canonical output	--output /tmp/.../run wrote index.jsonl, benchmark.json, timing.json, transcript.jsonl	unchanged; the same artifacts are written under the run directory

--output remains the canonical complete artifact boundary with index.jsonl, benchmark.json, timing.json, transcript.jsonl, per-test artifacts, and task bundles.

Verification

• bun run verify
• bun run validate:examples
• bun test apps/cli/test/eval.integration.test.ts
• Green UAT: bun apps/cli/src/cli.ts eval ... --dry-run --output /tmp/.../run --export /tmp/.../results.jsonl fails as unknown; --output /tmp/.../run writes the expected run artifacts.

Code review: manual simplification/review completed; subagent-based Tier 2 review was not run because this Codex session's multi-agent tool only permits spawning when the user explicitly asks for sub-agents. The simplification pass removed the now-dead flat-format writer dispatch and tests.

Post-Deploy Monitoring & Validation

No additional operational monitoring required. This removes an unreleased/cleanup CLI option; validation is via CI and user-facing CLI behavior (agentv eval run --help, agentv eval ... --output <dir>, and rejection of --export).

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