Merge upstream/main into fix/scene-director-callback-errors

changelog.d/1197-launch-library-provider-guidance.md

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+- Share Launch Library request cache keys across installations refreshing in the
+  same UTC minute, identify the app to the provider, and explain that standard
+  space-missions access needs no key. Optional higher-rate LL2 tokens are paid
+  upgrades; existing local cache and server-only token handling are unchanged
+  (rudycelekli, #1197).

changelog.d/1199-launch-cache-provenance.md

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+- Keep Space Missions marked STALE when Launch Library 2 falls back to cached
+  launch data, and return to NOMINAL after a fresh response without discarding
+  retained missions (rudycelekli, #1199).

changelog.d/686-terrain-heights-bounds.md

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+- Bound what a caller can grow through `/api/terrain/heights`. Every distinct
+  5-decimal point was a permanent in-memory entry, a permanent line in an
+  uncapped `.gev-cache/terrain-heights.json`, and a live upstream call, with
+  nothing limiting the rate. The point cache now holds at most 50,000 entries
+  and evicts oldest-first, a cache file above
+  24 MB is not read back, and the route is limited to 90 requests/minute per
+  client (270 global). Evicting a point costs one refetch, never a wrong
+  answer, since terrain does not move. Ordinary use is unaffected: a full
+  `test:track` run drives 10 requests, peaking at 8/min (daikaginza, #686).

changelog.d/975-terrain-cross-site-gate.md

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+- Cross-site pages can no longer fill the terrain-height cache or spend the
+  visitor's own `/api/terrain/heights` rate-limit quota through the visitor's
+  browser. The route refuses a cross-site `Sec-Fetch-Site` or a foreign or
+  opaque `Origin` before rate limiting, cache access or upstream work. Unlike
+  the cost-bearing routes it still answers same-origin requests that arrive
+  through a reverse proxy, so terrain keeps rendering behind nginx, Caddy or
+  Cloudflare instead of falling back to the geoid (Sunil56224972, daikaginza,
+  #975).