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Merge branch 'worktree-idea-recordset-analytics': recordops package

Introduces github.com/dal-go/dalgo/recordops — a new top-level
sub-package providing pure, dependency-free analytical helpers over
record collections. MVP capability: Diff, a streaming
one-baseline-vs-N-candidates comparison via K-way merge over
ID-sorted iter.Seq2 streams.

API surface:
- Diff[K cmp.Ordered] + DiffFunc[K comparable] (slices.Sort/SortFunc style)
- Four options: WithIgnoreFields, WithIncludeMatched,
  WithOnlyChangedFields, WithAbsentEqualsNil
- Four renderers: RenderYAMLGitStyle (per-candidate),
  RenderYAMLByID (cross-candidate divergence), RenderYAML, RenderJSON
- Two bridges: SliceToSeq, ReaderToSeq

100% line coverage, all tests passing. New dependency: gopkg.in/yaml.v3.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

# Conflicts:
#	spec/ideas/README.md

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