fix: restore original ID-based filenames to preserve cross-references

The manual rename to human-readable filenames broke agent knowledge
wiring — agent variables still referenced project IDs (e.g.,
zWQheH5BoVPriUiE) but the project files were renamed (company-context).
On import, the lookup failed silently and knowledge connections were
lost.

Restores all artifact files from the initial export commit (126da55)
so filenames match the IDs used in agent/flow variable references.

Human-readable filenames will be handled by the export code itself
(taskcade PR #26196) on the next "Update existing repo" export.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: deanzaka