Tom Boucher 1cb4bebcf5 feat(config): workstream config.json inherits from root .planning/config.json ...

- Add _deepMergeConfig() with correct null-override semantics
- loadConfig() reads root config.json when GSD_WORKSTREAM is set, then
  deep-merges with workstream config (workstream wins on conflict)
- Workstream without config.json falls back to root config entirely
- Migrations and disk writes operate on fileData (on-disk content) only,
  never on the merged result, to prevent workstream pollution
- Fixes null-override bug from PR #2717: explicit null in workstream now
  correctly overrides root value instead of falling back to root
- Tests: inherit root model_overrides, workstream override, nested
  workflow.* deep merge, explicit null override, missing workstream config

Closes #2714

2026-04-26 11:15:16 -04:00

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