Add unrecorded_patterns to dependency reachability (suppress record, preserve traversal)

[Copilot]

dependency_reachability only had excluded_patterns, which both removed a repo from output and pruned traversal through it. This made it impossible to model boundary repos that should be hidden as direct deps while still preserving coverage of transitive deps behind them.

• New exclusion mode: unrecorded_patterns

  • Adds a second repo-pattern control that suppresses direct recording of matching repos but continues descent through them.
  • Matching repos are not emitted as dependencies keys and are not attribution targets themselves.

• Traversal/recording split in the aspect

  • Refactors dep handling to separate:
    • record decision: gated by not excluded and not unrecorded
    • descend decision: gated by not excluded
  • Keeps existing excluded_patterns semantics unchanged (record + prune).

• Precedence and transition plumbing

  • Explicit precedence: if both match, excluded_patterns wins (stronger prune behavior).
  • Threads unrecorded_patterns through the same private build-setting transport used by other knobs:
    • new //dependency:_unrecorded_patterns setting
    • added to aspect attrs
    • added to transition outputs
    • set in each split-transition branch

• Rule/API and docs updates

  • Adds unrecorded_patterns to dependency_reachability (default []).
  • Reworks module docs to present both modes side-by-side, with trade-offs and precedence clearly called out.

• Exclusions test matrix expansion

  • Adds fixtures/assertions covering:
    • record suppression
    • preserved descent vs pruned descent contrast
    • attribution passthrough behind unrecorded boundary
    • precedence (excluded_patterns over unrecorded_patterns)
    • composition with excluded_edges
    • byte-identical behavior for explicit empty unrecorded_patterns = []

dependency_reachability(
    name = "dep-reachability",
    roots = [":root"],
    excluded_patterns = ["legacy_repo*"],      # prune + do not record
    unrecorded_patterns = ["boundary_repo*"],  # do not record, still descend
)

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