harness: retro from ios-login

[m6un]

Retro: ios-login

Date: 2026-03-05
PR: #3
Cycles: 1/3
Outcome: PASS

Findings

Category	Severity	Description
—	—	No findings. Build passed in a single cycle with no reviewer corrections required.

What the builder missed

Nothing. The builder completed the feature in one clean cycle. The PR diff matches the acceptance criteria exactly:

• CookieManager is the sole read/write point for App Group cookies, with a CookieStorage protocol enabling full test isolation without touching UserDefaults.
• ContentView and XLoginView access no network or storage directly.
• All 8 CookieManagerTests, 3 LoginDetectionTests, and 3 ContentViewTests were delivered on the first pass, each mapping 1:1 to a spec test case.
• Domain filtering (allow .x.com and .twitter.com, reject everything else) is present and tested.
• Corrupt-data guard in loadCookies() returns an empty array without crashing.
• Layer comments (// View layer, // Services layer, // Models layer) in each file match the architecture defined in docs/IOS.md.
• Piper.entitlements wires the group.com.piper.app App Group.
• Cancel path surfaces to the caller (.cancelled result), satisfying Belief harness: retro from ios-share-extension #6 (no silent failures).

What the reviewer caught correctly

There was no reviewer correction cycle. The clean pass demonstrates that:

• The spec's acceptance criteria were concrete and complete enough to fully drive the implementation.
• The CookieStorage protocol abstraction was the right design choice: it removed the need for any UserDefaults mocking in tests and eliminated a common iOS testing pain point that often produces second-cycle findings.
• The isLoginSuccess(url:) function being a pure predicate on Coordinator made it trivially testable without a live WKWebView, which would have required UI testing infrastructure not available in unit tests.

Harness improvements

None required. The spec was precise, the layer rules are clearly documented in docs/IOS.md, and the builder followed both without prompting.

Actions

(none)