feat(lists): enable editing GitHub-backed lists (add/close/reopen issues)

[Adron]

Summary

GitHub-backed lists were effectively read-only in the iOS app, even though the backend fully supports mutations by proxying them to the GitHub Issues API (POST→create, PUT→patch, DELETE→close). This branch enables adding issues and changing issue status (open ⇄ closed) from the app, and fixes a latent response-decode bug that affected all lists. It also carries the already-staged GitHub native-OAuth + Universal Links docs commits.

What's included

• lists: enable GitHub-backed list editing (commit 485ac8f)
  • ListPropertyDef now decodes isReadOnly and select/multiselect options (validationRules.options).
  • ListItemFormView hides read-only columns (#, url, timestamps) and renders select as a Picker.
  • ListDetailView toolbar shows the add (+) button on GitHub lists (alongside Refresh); the GitHub add/edit form is limited to title/body/state.
  • One-tap, reversible Close/Reopen swipe + context action on each GitHub row (replaces Delete for GitHub lists).
  • Status changes go through a full-row update (setGitHubState): the backend rebuilds the issue from the request alone and defaults a missing title to "Untitled", so a partial update would blank it. A row's id is the issue number, so PUT/DELETE already target the right issue.
  • Fix latent decode bug: addListItem/updateItem/updateRow decoded the response as { row }, but the backend returns { data } → the optimistic UI update silently threw noData (affected local lists too, masked by pull-to-refresh).
  • Docs: the-gaps.md (read-only → editable issues view) and a new CLAUDE.md gotcha on full-row GitHub updates + the data response key.
• docs: mark GitHub native OAuth + Universal Links as enabled (commits 46ac3b8, f9b98df)

Testing

• xcodebuild build — BUILD SUCCEEDED
• xcodebuild test -only-testing:InterlinedListTests/APIClientListsTests — 19 passed (6 new: add/update/close paths & payloads, {data} decode, schema isReadOnly/options).
• Full suite: xcodebuild test (serialized, pinned sim UDID) — 811 passed, 0 failures.

Caveats / follow-ups

• Not live-smoke-tested. These operations create/close real GitHub issues and require a linked GitHub identity with Issues scope. Recommend verifying on a device/sim against a throwaway repo: add an issue → swipe Close/Reopen → Edit the State picker.
• v1 scope: labels/assignees are display-only (deferred); title/body/state are editable.

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