🚨[Hotfix] Tolerate Cloudflare alias propagation

[maruson08]

Problem

Automatic deployment run 36149822267 uploaded v2.1.0 and passed its immutable deployment smoke test, but the stable Cloudflare alias had not propagated the new Image → Text route when checked seconds later. The workflow failed on a transient 404 even though the stable alias and production custom domain passed the complete smoke suite shortly afterward.

Fix

• Retry stable alias and custom-domain smoke checks up to six times with ten-second intervals.
• Keep immutable deployment validation immediate.
• Preserve all route, asset, redirect, indexing, canonical, and social-metadata assertions.
• Add static regression coverage for both aliases and the bounded retry contract.

Validation

• node tests/cloudflare-bridge.test.mjs
• npm test
• git diff --check
• Commit and PR-title convention validation
• Current immutable, stable, and custom production endpoints pass the full deployment smoke suite

Closes #88