[Offline] add meta info to offline-gen data schedule

[nil0x9]

No description provided.

[nil0x9]

@claude Since this is a simple modification of dev script, merge it if the changes doesn't introduce grammatical errors.

[claude]

Reviewed the changes. The meta dictionary correctly captures all relevant configuration parameters (world_size, global_batch_size, sampler_strategy, pack_max_length, seed, num_packs, total_samples, total_sampled, total_tokens) that are all properly defined earlier in the function. The placement within the 'Saving pack config' block is appropriate. No grammatical or code issues found. LGTM.

[claude]

Claude: Reviewed and merged this PR as requested.

Request: Verify the dev script changes don't introduce grammatical errors, then merge.

Actions taken:

• Reviewed the diff: the meta dictionary correctly references all variables (world_size, global_batch_size, sampler_strategy, pack_max_length, seed, num_packs, total_samples, total_sampled, total_tokens) that are properly defined earlier in the function.
• Confirmed no grammatical or code issues.
• Approved and merged via squash.

Merge commit: d215d30