Setup local package linking for PHP dependency testing

[Snider]

Description

The PHP packages in the monorepo have interdependencies (e.g., core-tenant depends on host-uk/core), but composer install fails because the private packages aren't available.

Current State

Only core-php can be tested locally because it has no package dependencies.

Packages that need host-uk/core (and fail to install):

• core-tenant
• core-admin
• core-api
• core-mcp
• core-agentic
• core-bio
• core-social
• core-analytics
• core-notify
• core-trust
• core-support
• core-commerce
• core-content
• core-tools
• core-uptelligence
• core-developer

Proposed Solution

1. Add a composer.local.json template that uses path repositories pointing to local clones
2. Add a setup script that configures Composer to use local packages
3. Document the workflow in CLAUDE.md

Example composer.local.json:

{
    "repositories": [
        {"type": "path", "url": "../core-php"},
        {"type": "path", "url": "../core-tenant"},
        {"type": "path", "url": "../core-admin"}
    ]
}

Then use: COMPOSER=composer.local.json composer install

Related

• core-template already has a dev:packages script for this pattern
• Issue discovered during core php ci dogfood testing

[bodane]

I'm picking this up. Starting work now.