[extension] Add Token Economy extension to community catalog

[github-actions]

Adds the Token Economy extension (token-economy) to the community catalog.

Summary

• Extension: Token Economy v1.0.0
• Author: @formin
• Repository: https://github.com/formin/spec-kit-token-economy
• Description: Token routing, measured savings, and context audit workflows.
• Commands: 3 | Hooks: 2
• Tags: tokens, routing, reporting, context

Changes

• extensions/catalog.community.json — new entry inserted in alphabetical order between token-budget and trace
• docs/community/extensions.md — new row inserted in alphabetical order between "Token Consumption Analyzer" and "V-Model Extension Pack"

Validation Results

All checks passed:

• ✅ Extension ID token-economy matches ^[a-z][a-z0-9-]*$
• ✅ Version 1.0.0 follows semver X.Y.Z
• ✅ Repository is public and accessible
• ✅ extension.yml present in repository
• ✅ README.md present in repository
• ✅ LICENSE present in repository
• ✅ GitHub release v1.0.0 exists
• ✅ Download URL follows archive/refs/tags/v1.0.0.zip pattern
• ✅ All Testing Checklist items checked
• ✅ All Submission Requirements checked
• ✅ JSON validated after edits

Closes #3048
cc @formin

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