openspec: archive profile-stats + profile-weekly-distance, sync specs

Both changes are implemented and merged (#539, #541). Promote their deltas into
openspec/specs/, move the changes to changes/archive/2026-06-14-*, and add the
two capabilities to the CAPABILITIES index.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

openspec/changes/profile-weekly-distance/proposal.md

@@ -1,40 +0,0 @@
-## Why
-
-The profile roll-up header (`profile-stats`) shows lifetime totals and a
-"last 4 weeks" count, but no sense of *cadence* — is this person ramping up,
-tapering, or consistent? Strava's weekly bars are the at-a-glance answer. A
-small weekly-distance bar chart turns the static totals into a trend, and the
-data is the same cheap aggregate we already lean on.
-
-## What Changes
-
-- Add a **weekly distance bar chart** to the profile, under the stats header:
-  one bar per week for the **last 12 weeks**, heights normalized to the busiest
-  week.
-- Compute it with one indexed aggregate (`sum(distance)` grouped by week) over
-  the same viewer scoping as `profile-stats` (public-only for visitors, full
-  for the owner) — **no cache table, no schema change**.
-- Hide the chart when the owner has no distance in the window.
-
-## Capabilities
-
-### New Capabilities
-
-- `profile-weekly-distance`: the weekly-distance bar chart on the profile — the
-  window, how empty weeks are shown, and how it is computed and scoped.
-
-### Modified Capabilities
-
-<!-- None at the requirement level. Builds alongside `profile-stats` (the
-     header it sits under); that capability's totals are unchanged. -->
-
-## Impact
-
-- **Depends on `profile-stats`** (PR #539) — the chart renders beneath that
-  header.
-- **Journal app**: a `getWeeklyDistance(ownerId, { publicOnly, weeks })` query
-  in `activities.server.ts`; the profile loader passes the series; a small
-  `WeeklyDistanceChart` component (SVG bars, reusing `stats.ts` formatters).
-- **i18n**: `journal.profileStats.weeklyDistance*` labels (en + de).
-- **No schema change, no GPX parsing** — `sum(distance)` grouped by
-  `date_trunc('week', …)` over the `owner_id`-leading indexes.