Update benchmark documentation with performance metrics

- Added micro-ops, policy throughput, and workload throughput metrics for LRU, LRU-K, and LFU cache policies to `benchmarks.md`.
- Updated the release summary to reflect the new alpha versioning and included links to the latest benchmark reports.

Author: TKorr

docs/benchmarks.md

@@ -14,29 +14,29 @@ Micro-ops (ns/op):
 
 | Cache | get_hit | insert_full | policy_only_touch |
 | --- | --- | --- | --- |
-| LRU | TBD | TBD | n/a |
-| LRU-K | TBD | TBD | n/a |
-| LFU | TBD | TBD | TBD |
+| LRU | 30 | 147 | n/a |
+| LRU-K | 47 | 191 | n/a |
+| LFU | 92 | 216 | 63 |
 
 Policy throughput (Melem/s = million operations per second):
 
 | Cache | insert_get | eviction_churn | pop | touch_hotset |
 | --- | --- | --- | --- | --- |
-| LRU | TBD | TBD | TBD | TBD |
-| LRU-K | TBD | TBD | TBD | TBD |
-| LFU | TBD | TBD | TBD | TBD |
+| LRU | 10.45 | 6.27 | 17.58 | 26.43 |
+| LRU-K | 6.77 | 4.24 | 12.36 | 15.71 |
+| LFU | 7.59 | 4.19 | TBD | TBD |
 
 Workload throughput (Melem/s, 200k ops):
 
 | Cache | uniform | hotset_90_10 | scan |
 | --- | --- | --- | --- |
-| LRU | TBD | TBD | TBD |
-| LRU-K | TBD | TBD | TBD |
-| LFU | TBD | TBD | TBD |
+| LRU | 6.54 | 20.01 | 6.97 |
+| LRU-K | 5.40 | 17.32 | 5.02 |
+| LFU | 4.56 | 8.49 | 4.93 |
 <!-- LATEST_RUN_END -->
 
 ## Release summary
 
 | Release | Date | Environment | Micro-ops (ns/op) | Policy throughput (Melem/s) | Workload throughput (Melem/s) | Report link |
 | --- | --- | --- | --- | --- | --- | --- |
-| v0.1.0 | 2025-01-12 | TBD | TBD | TBD | TBD | TBD |
+| v0.1.0-alpha | 2026-01-13 | local | See “Latest run” | See “Latest run” | See “Latest run” | `target/criterion/report/index.html` |