Add Frankfurter FX packaged skill

[Ayush7614]

Summary

• Adds an opt-in Frankfurter FX packaged skill (Chrome + Firefox) for ECB reference currency conversion.
• Tools hit https://api.frankfurter.dev directly so skill HTTP calls do not fail on redirects from api.frankfurter.app.

Test plan

• Settings → Skills shows Frankfurter FX as available (not default-on)
• Enable skill, ask to convert e.g. 10 USD to EUR, confirm tool calls succeed
• Confirm skill text warns against api.frankfurter.app
• node test/run.js packaged-skill assertions for frankfurter-fx

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[Copilot]

Pull request overview

Adds an opt-in Frankfurter FX packaged skill for ECB currency conversion across Chrome and Firefox.

Changes:

• Adds mirrored skill manifests with secure, read-only API tools.
• Registers the skill in both browser catalogs.
• Adds packaged-skill and opt-in behavior tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/chrome/skills/frankfurter-fx.md	Defines Chrome FX tools and guidance.
src/firefox/skills/frankfurter-fx.md	Mirrors the Firefox skill definition.
src/chrome/src/agent/skills.js	Registers the Chrome packaged skill.
src/firefox/src/agent/skills.js	Registers the Firefox packaged skill.
test/run.js	Tests manifests, endpoints, opt-in status, and parity.

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