* fix(github): attribute GitHub API outages instead of blank/"failed" states
When GitHub's API is unreachable (5xx outage, network, or rate limit), Orca
showed no PR data with no explanation, so it read as an Orca bug rather than a
GitHub-side problem.
- Add a shared classifier (classifyGitHubUnavailable) reused by the main
process and the renderer so every surface attributes an outage identically.
A live outage returns HTTP 5xx, which the PR-refresh classifier previously
had no branch for (fell through to the un-attributed "refresh failed").
- Right-sidebar Checks panel: show GitHub-attributed copy in the error
empty-state, plus an inline banner over stale cached PR data so an outage
doesn't look like a normal (silently out-of-date) panel.
- Tasks/PR-list page: replace the vague "N of M projects failed to load" with
a GitHub-attributed banner when the failure is a reachability problem.
Copy names GitHub as the source and reassures it isn't an Orca problem, with no
status-page link. Stays GitHub-scoped so GitLab/other providers aren't
mislabeled.
* fix(github): keep outage attribution accurate
* fix(github): preserve outage attribution edge cases
* fix(github): preserve Tasks outage attribution
* fix(github): avoid false outage attribution
* fix(runtime): tolerate absent browser certificate state
* fix(ui): preserve exhaustive optional state handling
* fix(github): preserve outage attribution for combined queries
* fix(github): preserve runtime failure attribution
* chore: restore unrelated UI files to main (out of scope)
native-chat-session-option-labels.ts and skill-freshness-group.tsx switch
tweaks were unrelated to GitHub API outage attribution — they fix pre-existing
switch-exhaustiveness lint on main, which this PR's CI (oxlint) doesn't gate on.
Restore them to origin/main so this PR's diff stays focused; the exhaustiveness
cleanup belongs in its own change. (sync-runtime-graph.ts is already identical
to main, so no diff there to revert.)
* fix(github): drop Orca self-reference from outage copy
* fix(github): drop em-dashes from outage copy
