fix(mobile): hydrate peer presence before live heartbeat

[BrianInAz]

Summary

• hydrate tracked iOS peer presence immediately through the existing authenticated kind 20001 relay query
• preserve live WebSocket updates as the fast path with race-safe snapshot merging
• refresh tracked peers every 60 seconds and rehydrate immediately after reconnect
• retain the existing public Map<String, String> provider contract and unchanged widgets
• add deterministic regression coverage, screenshots, the Beads execution record, and an as-built repository document

Root cause

iOS previously consumed only ephemeral live presence events. Events received before a DM pubkey was tracked were discarded, and ephemeral events are not stored or replayed. An already-online peer therefore remained gray until its next heartbeat. Relay connectivity and peer presence are separate signals.

TDD and validation

• presence provider: 15/15 passed
• just mobile-check: passed
• full mobile suite: 1,107 passed, 1 intentional skip, 0 failed
• full Hermit-backed repository just ci: passed after the branch was refreshed onto current main
• formatting, diff, scope, lockfile, untracked-file, and changed-file secret checks: passed
• lockfiles: unchanged
• isolated iOS 26.5 simulator acceptance: 5/5 cold launches and 5/5 foreground reconnect cycles showed both expected peer dots green within five seconds

Simulator acceptance used only the worktree-specific debug bundle. The existing public Home Lab CA was trusted only in that isolated simulator after explicit approval. The unbacked physical iOS 27 beta phone was not touched. One final cold-launch proof will be repeated from the merged main build.

Promotion prerequisites resolved

The branch was merged forward, without force-pushing, through signed-off commit e3b5e4cd9c92 onto verified main commit f73b2bdd5d95.

• PR fix(ci): correct desktop path filter scope #26 corrected the CI Desktop path classifier that had incorrectly selected macOS for mobile-only changes.
• PR fix(mobile): preserve channel scroll anchor on updates #27 independently delivered the authorized mobile scroll-anchor remediation; it is supplied by main and is not part of this PR's unique diff.
• PR fix(ci): bootstrap Sprig rolling release #29 repaired Sprig rolling-release bootstrap.
• PR test(desktop): await thread scroll anchor #31 imported the upstream Desktop test correction without a local production workaround.
• PR fix(desktop): flush stale channel autocomplete before Enter #33 fixed the pre-existing Desktop stale channel-autocomplete Enter race exposed by that corrected test.

Exact-SHA post-merge validation for the integration base is green: CI 31535160441, Sprig 31535160539, and Helm 31535160483.

Evidence and tracking

• Beads epic: ios-buzz-59e
• As-built record: docs/ios-peer-presence-hydration.md
• Before screenshot
• After screenshot

Scope boundaries

No Desktop, CLI, relay, Hermes runtime, heartbeat, TTL, authentication, membership, or protocol changes are included. No peer identity, private key, or private device identifier is hardcoded or documented.

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