Fixes for discover

[tony]

Changes

Bug Fixes

vcspull discover: Success logs redact config paths

Writes triggered by vcspull discover now pass the config file through
PrivatePath, so confirmations like "✓ Successfully updated ~/.vcspull.yaml"
and dry-run notices no longer leak the absolute home directory.

vcspull discover: Fix another workspace dir case

Discover now inspects the config scope (user/system/project) before writing,
so user-level configs like ~/.vcspull.yaml prefer tilde-prefixed workspace
keys while project-level configs keep their relative ./ sections. Tests
cover both behaviors to guard against regressions.

[codecov]

Codecov Report

❌ Patch coverage is 97.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.52%. Comparing base (14e3002) to head (78fd3fe).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
src/vcspull/cli/discover.py	97.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #487      +/-   ##
==========================================
+ Coverage   77.95%   78.52%   +0.56%     
==========================================
  Files          14       14              
  Lines        1901     1937      +36     
  Branches      401      404       +3     
==========================================
+ Hits         1482     1521      +39     
+ Misses        272      271       -1     
+ Partials      147      145       -2     

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