fix(coverage): correct stale .coveragerc source list
The [run] source list named `muse` (deleted in the muse→talent rename) and omitted the `solstone/apps` and `solstone/talent` production trees. Drop the phantom `muse` and declare all five top-level packages so the coverage source declaration is accurate for config-driven consumers.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>