chore: add contributor devcontainer

[Soumoditya]

Summary

• add a VS Code devcontainer for the Node, Python, Bun, and Docker toolchain
• install the pinned pnpm version plus uv and Bun on first creation
• install the root workspace and Bun-native store dependencies automatically
• forward the documented docs, store, and API ports

Closes #211

Validation

• devcontainer.json parses as valid JSON
• git diff --check

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 3984c62 and fe5d1f7.

📒 Files selected for processing (2)

• .devcontainer/devcontainer.json
• .devcontainer/post-create.sh

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[lukaadzic]

@Soumoditya six of yours landed in one go: #214, #215, #216, #218, #220 and this devcontainer. The org-invite fix in #216 was the good one, that silent downgrade to member had been sitting there a while. I left notes on #219, #221 and #223 if you want to keep going.

Unrelated ask: I noticed you forked the repo but haven't starred it. If gnt has been useful to you, a star genuinely helps. It's most of how people find this thing, and the people who need a policy check in front of their agent mostly aren't searching for it yet.