docs: retire the two root queues, archive the ranking (V-447)

PROGRESS.md and 20-07-2026-BACKLOG.md were state snapshots that git log and
the Vikunja board already carry. Everything PROGRESS.md claimed as shipped is
a QA task. The backlog's only untracked item, bounded follow-up state, is now
V-448.

maven-feature-ranking.md moves to docs/archive/2026-07-03-feature-ranking.md
instead of dying. Its mandatory and easy tiers became V-449 through V-458; the
doable and epic tiers are reasoning about why things are not worth doing yet,
which no task captures.

Four code comments and the design.md ledger pointed at the deleted files.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Xwomr2cT93KMSz9u3digX5

internal/delivery/voicesink/voicesink.go

@@ -19,7 +19,7 @@
 //  3. if no live session exists, Send returns voice.ErrNoSession
 //     (wrapped). The daemon logs the partial dispatch; an OPEN deferred
 //     question is whether the dispatcher should reroute to away-channels
-//     instead of returning partial — listed in PROGRESS.md.
+//     instead of returning partial.
 //
 // Import direction: voicesink imports internal/tts (synth seam) and
 // internal/voice (Sessions registry). Both are siblings of delivery; the

internal/event/event.go

@@ -1,5 +1,4 @@
-// Package event is the unified intake envelope (Vikunja #283,
-// 20-07-2026-BACKLOG.md item 1).
+// Package event is the unified intake envelope (Vikunja #283).
 //
 // # The problem it solves
 //

internal/morning/morning.go

@@ -1,5 +1,5 @@
 // Package morning is maven's morning routine engine — item #3 off the
-// 2026-07-20 backlog (see Maven/20-07-2026-BACKLOG.md).
+// 2026-07-20 backlog (Vikunja #280).
 //
 // A Routine is NOT four independent reminder timers. It's a checklist for a
 // daily window: several Items, each evidenced by a fact key, completed in