docs: add submission artifacts and uptime tracking

docs/baseline/uptime-evidence-log.md

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+# Uptime Evidence Log
+
+Use this log only after the production deployment is live.
+
+## Production URL
+
+- Final URL: `https://cpt304-taskify-coursework.vercel.app/`
+- Deployment date: `2026-05-09`
+
+## Required 7-day evidence window
+
+- Day 0: May 9, 2026
+- Earliest valid 7-day screenshot date: May 16, 2026
+
+## Checkpoints
+
+| Date | Checked by | Result | Screenshot filename / note |
+| --- | --- | --- | --- |
+| 2026-05-09 |  | Live after deployment | Homepage available at `https://cpt304-taskify-coursework.vercel.app/` |
+| 2026-05-10 |  |  |  |
+| 2026-05-11 |  |  |  |
+| 2026-05-12 |  |  |  |
+| 2026-05-13 |  |  |  |
+| 2026-05-14 |  |  |  |
+| 2026-05-15 |  |  |  |
+| 2026-05-16 |  | 7+ days complete |  |
+
+## Suggested final evidence
+
+- one screenshot showing the live site on or after `2026-05-16`
+- optional Vercel deployment history screenshot if available

live-url.txt

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+https://cpt304-taskify-coursework.vercel.app/