chore: Proposal to upgrade the XRC to release 2026.06.26

[mbjorkqvist]

Proposal to upgrade the XRC to release 2026.06.26.

[github-actions]

canbench 🏋 (dir: src/xrc) 65ea6c6 2026-06-26 11:04:47 UTC

✅ src/xrc/canbench_results.yml is up to date
📦 canbench_results_benchmark.csv available in artifacts

---------------------------------------------------

Summary:
  instructions:
    status:   No significant changes 👍
    counts:   [total 9 | regressed 0 | improved 0 | new 0 | unchanged 9]
    change:   [max +201.83K | p75 +9.36K | median +2.99K | p25 +340 | min -24.95K]
    change %: [max +0.69% | p75 +0.03% | median 0.01% | p25 0.00% | min -0.23%]

  heap_increase:
    status:   No significant changes 👍
    counts:   [total 9 | regressed 0 | improved 0 | new 0 | unchanged 9]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  stable_memory_increase:
    status:   No significant changes 👍
    counts:   [total 9 | regressed 0 | improved 0 | new 0 | unchanged 9]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

---------------------------------------------------
CSV results saved to canbench_results.csv

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to ebbd61f.

Security Overview

• 🔎 Scanned files: 1 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/539e645e-584d-404e-98be-6f1c4e3c01e0?scanId=89efb12a-58d0-4537-ae89-fc8e11fb40bd&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► deployment/mainnet/exchange_rate_canister_upgrade_2026_06_26.md     Add proposal for exchange rate canister upgrade, including motivation for dropping CryptoCom USDT-USDC source and recording empty exchange windows as no_data.

[gregorydemay]

Thanks @mbjorkqvist !