fix(claude): remove Nix management of known_marketplaces.json - #513

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Performed full review of a14c1e9...cf527df

Analysis

1. Removing known_marketplaces.json from Nix management properly separates static configuration from dynamic runtime state, but creates a bootstrapping issue where new installations won't have required marketplaces until manually added.

2. The safety-net@cc-marketplace plugin remains enabled in settings.json but its source marketplace is no longer automatically provisioned, creating a potential failure case on fresh installations.

3. While improving reliability by preventing Nix rebuild failures caused by Claude's runtime mutations, this change slightly reduces system reproducibility as marketplace configuration becomes environment-specific.

4. Migration requires ensuring existing state files are writable and not garbage-collected by Nix, with Claude recreating the file as needed for new installations.

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