feat(inquirerer-utils): add suppressUpdateCheck to write cache entry after update

[pyramation]

feat(inquirerer-utils): add suppressUpdateCheck for post-update cache

Summary

Adds a new exported function suppressUpdateCheck(toolName, currentVersion) to @inquirerer/utils, alongside the existing clearUpdateCache.

Problem: After a CLI update command (e.g. pgpm update) installs a new version, clearUpdateCache deletes the cache file. The next CLI invocation — still running under the old binary due to process/shim timing — finds no cache, fetches the latest version from npm, compares it against the stale pkgVersion, and shows a false-positive "Update available" message.

Solution: suppressUpdateCheck writes a cache entry with latestVersion set to the current binary's version. The next checkForUpdates call sees latestVersion === pkgVersion → hasUpdate: false. The cache expires after 24h, at which point a fresh check runs against the (by then correct) new binary.

This is a companion to constructive#749 which updates the pgpm update command to call suppressUpdateCheck instead of clearUpdateCache.

Review & Testing Checklist for Human

• Cache format coupling: suppressUpdateCheck writes { latestVersion, timestamp } — the same internal format that checkForUpdates reads (lines 137-138 of update-check.ts). Verify this stays consistent. Both are in the same file, but worth confirming.
• Fallback behavior: On write failure, the catch block calls clearUpdateCache, which re-exposes the original bug (false-positive update message). Confirm this is acceptable as a best-effort fallback vs. silently failing.
• No unit tests added: The package currently has zero tests (--passWithNoTests). Consider whether a test for this function is needed before merging, especially to lock in the cache format contract.

Notes

• Link to Devin run: https://app.devin.ai/sessions/c5154f4af6e54b898aaec4806cb8549a
• Requested by: @pyramation

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