Quiet the expected ENOENT in image-cache script

[narthur]

Summary

• `scripts/image-cache.mjs` calls `readdirSync` on the astro asset cache folder; on a clean checkout (e.g. fresh Render build) that folder doesn't exist yet and `readdirSync` throws `ENOENT`.
• The current `console.warn(e)` dumps the full Error object including stack trace, which makes build logs look like something failed even though the script catches and continues.
• This PR treats `ENOENT` as the expected first-build case and logs a single info line; other error codes still log loudly so we don't hide a real problem.

Test plan

• Manual: run with a missing folder → "image-cache: no astro cache yet at … skipping", exit 0
• Manual: point at an existing non-directory file (`ENOTDIR`) → loud warning with the error, exit 0
• CI green

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR reduces noise from the image cache script during clean builds by treating a missing Astro asset cache directory as an expected condition while preserving loud logging for other filesystem errors.

Changes:

• Handles ENOENT from readdirSync with a concise informational message.
• Keeps warning output for unexpected errors such as ENOTDIR.

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[github-actions]

Build Performance

⚡ -0.13s (-2.1%) average build time

	Base (66f3a8d)	Head (ed1dbc9)
Average	6.07s	5.94s
Runs	6.05,6.07,6.09	5.94,5.93,5.95

3 timed builds after one warm-up build per commit.

[github-actions]

Accessibility Issues

Summary

No baseline issues found.

Baseline	Head
0	0

Issue Breakdown

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