Summary

_format_freshness_report in scripts/check_kernel_freshness.py builds the Slack
alert using only result['source_url'], never including result['kernel_dir'].

Problem

Several local kernels share the same upstream. For example, flash-attn2,
flash-attn3, flash-attn4, layer-norm, rotary, and vllm-flash-attn3 all
map to https://github.com/Dao-AILab/flash-attention.

When any are stale, the Slack report prints the same URL multiple times with no
indication of which local directory needs updating:

📊 Kernel Freshness Report - 3 kernel(s) behind upstream

• https://github.com/Dao-AILab/flash-attention: upstream is 12 days newer
• https://github.com/Dao-AILab/flash-attention: upstream is 5 days newer

Affected file

scripts/check_kernel_freshness.py, function _format_freshness_report, line 257.

The kernel_dir key is already populated in each result dict (line 196) — it is
just never used in the output string.

Proposed fix

Before:

items.append(f"• {result['source_url']}: upstream is {result['days_behind']} days newer")

After:

items.append(f"• {result['kernel_dir']} ({result['source_url']}): upstream is {result['days_behind']} days newer")

One-line change. No new dependencies, no behaviour change beyond the string format.