Hub: Cora review history viewer

[ajianaz]

Description

View past Cora code reviews — browse SARIF results, track issues over time.

Features

• List past reviews (date, repo, severity breakdown)
• SARIF viewer (findings by severity/file)
• Trend chart (bugs over time)
• Filter by severity, file, rule

[ajianaz]

Update: a working prototype was built during a frontend pass — branch feat/20-review-history (GitHub Code Scanning viewer: severity breakdown + filters, weekly trend, pagination via Link header, 8 unit tests, CI green). PR #282 was closed unmerged because this feature belongs to the Hub product (phase/3-multi-product), not Corin's memory workstation scope. The branch can be repurposed/rebased when the Hub phase kicks off.