feat: Phase 4 hardening — retry/backoff, loop detection, sync status UI + tests
Phase 4.1 — Retry/backoff for failed permission pushes:
- _compute_next_retry(): capped exponential backoff with jitter (60s–1h)
- _record_push_result(): tracks push_attempts and next_retry_at per link
- replay_pending_pushes(): skips links still in backoff window, logs deferred count
- _load() migration: adds push_attempts/next_retry_at to existing records
Phase 4.2 — Loop detection (A→B→A routing cycle):
- set_peer_route_via(): returns 409 if target cell already routes peers through us
- apply_remote_permissions(): soft warning when accepting exit-relay that would cycle
Phase 4.3 — Sync staleness indicator in Cell Network UI:
- SyncBadge component: green (synced), amber (pending/failed), gray (never)
- Shows relativeTime of last sync + error message + next retry estimate
- Injected into CellPanel header alongside tunnel online/handshake status
Tests (54 new):
- TestCheckInviteConflicts: subnet overlap, domain conflict, exclude_cell (9 tests)
- TestPushInviteToRemote: success, 4xx, no endpoint, subprocess errors (7 tests)
- TestAcceptInviteNew: new cell, idempotent, healing dns/subnet changes (16 tests)
- TestAddConnectionMutualPairing: push-invite call, non-fatal failure (5 tests)
- TestPeerSyncAcceptInvite endpoint: happy path, field validation, error propagation (16 tests)
- Fixed 2 existing replay tests to clear backoff gate (simulates elapsed window)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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