refactor: move TraceFilter and tracepoint selector logic out of flags.Config

- Add tracepoints.Selector type with ShouldAttach method and ParseSelector
  constructor, replacing the raw TracepointsToAttach/TracepointsToExclude
  regex slices on flags.Config.
- Add flags.BuildTraceFilter as a standalone function replacing the
  Config.TraceFilter() method, keeping filter-building logic out of the
  config struct.
- Remove stale ShouldIAttachTracepoint noise-filter entry from Magefile.
- Add selector_test.go with full coverage of ParseSelector and ShouldAttach.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/internal/ior.go b/internal/ior.go
index 433484d..9a60869 100644
--- a/internal/ior.go
+++ b/internal/ior.go
@@ -367,9 +367,10 @@ func newEventLoopConfig(cfg flags.Config) eventLoopConfig {
 	}
 }
 
-// traceFilterFromConfig delegates to the canonical Config.TraceFilter method.
+// traceFilterFromConfig delegates to flags.BuildTraceFilter to resolve the
+// active event filter from the CLI configuration fields.
 func traceFilterFromConfig(cfg flags.Config) globalfilter.Filter {
-	return cfg.TraceFilter()
+	return flags.BuildTraceFilter(cfg)
 }
 
 func newLogger(verbose bool) func(...any) {