#216 namespace alignment — resolve DIRTY conflict + land

[trilamsr]

PR #216 (tracecore.* → otelcol_* namespace alignment) is DIRTY/CONFLICTING after #215/#217 landed during its CI cycle. Needs:

1. git merge origin/main in worktree
2. Resolve conflicts (likely CHANGELOG + selftel.go files in clockreceiver/otlphttp per cross-cut review notes)
3. make check + go test ./... green
4. Push + verify mergeable
5. Auto-merge already armed; will fire on next CI green

Agent for #216 was rate-limited mid-resolution. Resume after 2:50am PST.

[trilamsr]

Resolved by agent (commits 73d0d1b + 7524fad on pr-otelcol-namespace-alignment). PR #216 now MERGEABLE, auto-merge armed. Closing.