Sharing config across multiple repos

[jaydeland]

For our use-case we want to add SpecKit to our internal developers platform, which is managed via a single repo. In this platform we launch claude from our platform repo and add other repo dirs to the CLI for context and operation.

In order to make this work we have added statements to our constitution:

- The shared configuration file at `PATH/shared-config.md`
  MUST be read at the start of each workflow to understand project-wide
  conventions, standards, and constraints (see Environment Configuration section
  for details)
- Repository-specific agent configuration files (AGENT.md or AGENTS.md) MUST be
  searched for and read in the current working directory to understand
  repository-specific guidelines, conventions, and context
- Workflow commands (/specify, /plan, /clarify, /tasks, /analyze, /implement)
  MUST look for required shell scripts in the PATH/platform directory,
  specifically under PATH/platform/.specify/scripts/bash/
- Workflow artifacts (spec.md, plan.md, research.md, tasks.md, contracts/,
  data-model.md, quickstart.md, *.md) MUST be created, edited, and read from the git
  repository root of the directory where Claude is started, not in the devyard
  directory

This resulted in claude updating all the script locations in the MD templates, but otherwise it works. The only thing missing would be the ability to define constitution additions and/or overrides at the repo level. Similar to how Claude config works.