docs(run): document generated task bundles

[christso]

Summary

AgentV docs now point authors at the generated run folder/task bundle as the portable audit and rerun surface, instead of implying they should maintain a parallel source-side bundle convention. This keeps the public guidance aligned with the recently merged task bundle artifacts and preserves source-side case directories as optional organization for bulky eval inputs.

What changed

• Documented the normal --output <run-dir> workflow and the generated per-result task bundle layout (task/EVAL.yaml, task/targets.yaml, copied task/files, copied task/graders).
• Clarified that index.jsonl links to generated bundle paths such as task_dir, eval_path, targets_path, files_path, and graders_path.
• Cross-linked benchmark provenance guidance to generated task bundles and reframed case directories as optional authoring organization, not a first-class artifact schema.
• Updated Results and Dashboard docs to direct review/files workflows at generated run artifacts.

No runtime schema, command, or artifact format changes are included.

UAT evidence

• Red: before this branch, running-evals documented --output only as an index.jsonl run directory and did not describe generated task bundle paths; benchmark-provenance framed source-side case directories as task artifacts and included peer-harness-specific examples.
• Green: this branch documents generated task bundles as the portable audit/rerun surface, names the index.jsonl link fields, and keeps source-side case directories optional.

Verification

• bun --filter @agentv/web build
• bun run validate:examples
• bun run lint
• Push hook: typecheck + lint passed

Post-Deploy Monitoring & Validation

No additional operational monitoring required. This is a docs-only change with no runtime behavior, schema, command, or artifact format impact.

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