Episode: Deeper pyramid levels (z6+ on demand)

EPISODE-GOAL

Extend the equirectangular tile pyramid beyond z5: generate z6+ tiles on demand with --tile, add them to the index, and have the globe page fetch them when zoomed in.

EPISODE-PHASE

phase 2

EPISODE-ACCEPTANCE

• Can scripts/etopo-tiles-build.sh --tile Z ROW COL produce a z6 tile that check validates against the manifest?
• Is the new tile added to tiles/index.json without regenerating z1..z5?
• Does the globe page request a z6 tile for a zoomed-in window, and does the tile render in the detail patch without exception?
• Is the whole change reviewable in one sitting?

EPISODE-RISKS

• Does on-demand generation keep the full z1..z6 pyramid from being built eagerly (it would be far too large)?
• Do the fetch paths (URL scheme) match what the browser requests?

EPISODE-TASKS

• Add z6+ on-demand generation to scripts/etopo-tiles-build.sh.
• Extend the index format to record per-tile availability, not a fixed pyramid.
• Update the globe page’s zoomed fetch to use deeper levels.
• Extend tests/05-etopo-tiles-build.sh to cover on-demand z6 generation.
• Verify in headless Chrome: zoom to a window that requests z6.

EPISODE-OUTPUT

Report the changed scripts, the tile/URL scheme, and the headless-Chrome verification result.

EPISODE-FILES

• scripts/etopo-tiles-build.sh — existing
• dataflow.out/tiles/index.json — existing (generated)
• site.in/globe.js — existing
• tests/05-etopo-tiles-build.sh — existing

EPISODE-BRANCH

llm/episode-02