runsascoded/dffs#3 Add shell-integration, -C/--cached flag, fix exit codes, modernize CI

Summary

• Add dffs-shell-integration command for convenient shell aliases with c (back-compat) and n (no-color) variants
• Add -C/--cached flag to git-diff-x for comparing HEAD vs staged changes
• Fix exit code propagation in git-diff-x and comm-x
• Improve test assertions: replace vague in checks with precise line-by-line comparisons
• Remove deprecated Tuple import, use built-in tuple
• Update CI workflow to match ghpr/git-didi pattern

Shell Integration

New dffs-shell-integration command outputs aliases:

eval "$(dffs-shell-integration bash)"           # All aliases
eval "$(dffs-shell-integration bash diff-x)"    # Only diff-x aliases
eval "$(dffs-shell-integration bash comm-x)"    # Only comm-x aliases
eval "$(dffs-shell-integration bash git-diff-x)" # Only git-diff-x aliases

Aliases provided (color enabled by default):

• diff-x: dx, dxc (back-compat), dxn (no-color), dxw, dxcw, dxwn
• comm-x: cx, cx1, cx2, cx3, cx12, cx13, cx23
• git-diff-x: gdx, gdxc (back-compat), gdxn (no-color), plus variants:
  • gdxs/gdxcs/gdxsn = compare HEAD vs staged (--cached)
  • gdxr/gdxcr/gdxrn = compare refspec (-r)
  • gdxf/gdxcf/gdxfn = compare single ref (-R)
  • gdxw/gdxcw/gdxwn = ignore whitespace (-w)
  • Combinations: gdxsw, gdxcsw, gdxswn, gdxrw, gdxcrw, gdxrwn, gdxfw, gdxcfw, gdxfwn
  • c variants are vestigial (same as base) for backward compatibility
  • n variants add --no-color

git-diff-x --cached

Compare HEAD vs staged changes (like git diff --cached):

git-diff-x --cached jq. file.json
# Or use alias:
gdxs jq. file.json

Exit Code Fixes

git-diff-x and comm-x now properly exit non-zero when pipeline commands fail (e.g., when a file doesn't exist in HEAD).

CI Improvements

• Separate jobs for build, TestPyPI, and PyPI publishing
• Trusted publishing with OIDC tokens
• RC tags publish to TestPyPI
• Include tag annotation in GitHub releases

Test Plan

• ✓ All 61 tests pass
• ✓ Shell integration works for bash/zsh
• ✓ Filtering by CLI works correctly
• ✓ -C flag compares HEAD vs staged changes
• ✓ Exit codes propagate from failed pipelines

🤖 Generated with Claude Code