[WIP] Add sigmap instructions for multiple projects in folder

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>folder with multiple projects</issue_title>
<issue_description>I have several projects (git repos) under one folder - something like monorepo.

main/
├─ repo1/
├─ repo2/
├─ repo3/

and it doesn't work in main/
I need to run manually for every project.</issue_description>

Comments on the Issue (you are @copilot in this section)

@manojmallick Two options available right now:

Option 1 — sigmap --each (recommended for your case)

Run from your parent directory (the one that contains all your git repos):

cd ~/projects   # parent of repo-a/, repo-b/, repo-c/
sigmap --each

Each sub-repo gets its own copilot-instructions.md written into it. No config needed.

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Option 2 — sigmap --monorepo

For workspaces where your repos live under packages/, apps/, or services/ inside a single git root. Just fixed a bug in this release where it was outputting CLAUDE.md instead of copilot-instructions.md — that's now resolved.

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Option 3 — Single aggregated context at root level

If you want one combined copilot-instructions.md that covers all your repos:

cd ~/projects
sigmap --init           # creates gen-context.config.json

Then edit gen-context.config.json and list your repos as source dirs:

{
  "srcDirs": ["repo-a/src", "repo-b/src", "repo-c/src"]
}

Then run sigmap — you get one output that spans all three repos.

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All three options are available in the latest release. --each is the most direct fix for your setup.