fix(ci): use full function_id as registry name to avoid collisions

[guibeira]

Summary

The skills v0.1.2 publish (failing job) was rejected by the registry with:

HTTP 422
{"error":"functions[4].name: duplicate of functions[0]"}

skills registers functions in two namespaces (skills::* and prompts::*) and derive_registry_function_name was stripping the namespace via rsplit("::", 1)[1], collapsing distinct function ids onto the same names:

function_id	derived name (before)
skills::list	list
prompts::list	list
skills::register	register
prompts::register	register
skills::unregister	unregister
prompts::unregister	unregister

Default to the full function_id, so the registry sees skills::list and prompts::list as distinct. The metadata.registry_name / metadata.name overrides stay first in priority — workers that want a friendly short name can still opt in.

Test plan

• Re-dispatch create-tag.yml with worker=skills, bump=patch, tag=next after this lands.
• Build payload step shows function entries with names like skills::list, prompts::register, etc. (no duplicates).
• POST /publish returns HTTP 200.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 39263198-d737-4d16-959d-782604487d8a

📥 Commits

Reviewing files that changed from the base of the PR and between e98a88c and 49c3fe5.

📒 Files selected for processing (1)

• .github/scripts/build_publish_payload.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/registry-function-name-keep-namespace

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