[codex] Add friendly scheduled task templates to public plugins

[abhinav-oai]

Summary

Adds one weekday scheduled-task template to each plugin whose canonical source is openai/plugins, using the friendlier task titles from the scheduled-tasks UX feedback. This is the public-source half of the replacement for the stale combined draft openai/plugins#366; the maintained-source half is openai/oai-maintained-plugins#356.

The stable template filenames, prompts, and schedules are unchanged from the reviewed combined draft. Only the user-visible name values were made friendlier, and every affected manifest receives a patch bump so the new templates can ship.

Plugin	New task title	Version bump
Asana	Daily task update	0.1.4 → 0.1.5
Canva	Daily design follow-ups	1.0.2 → 1.0.3
ClickUp	Daily task update	1.0.3 → 1.0.4
Datadog	Morning service update	0.1.2 → 0.1.3
GitHub	Daily PR update	0.1.6 → 0.1.7
Granola	Today's meeting follow-ups	1.0.3 → 1.0.4
Linear	Daily issue update	0.0.3 → 0.0.4
Supabase	Daily backend update	0.1.10 → 0.1.11
Vercel	Daily deployment update	0.21.3 → 0.21.4

Why this split

The live global plugin registry maps these nine plugin IDs to openai/plugins. The other eleven scheduled-task plugins now map to the maintained source, so they should not be added here.

Validation

• Parsed every new scheduled JSON file with jq and checked the staged diff with git diff --check.
• Compared all 20 replacement templates across both split branches against the old draft after removing only .name: 20/20 are identical (same prompt and schedule).
• Confirmed this PR contains exactly nine new scheduled files and nine manifest version edits, with no unrelated files.
• cloud-plugin-admin is not installed in this local workspace, so the publisher-side validator still needs to run in the normal release environment.