0.6.0

Added

• External contract version 3 (ADR-012).
  • std.external.tool_use_id joins an external run to the exact turn that made the MCP call. The
    Stop hook now records mcp__* tool-use ids from the transcript, including sub-agent transcripts,
    as std.artefact.mcp_tool_use_ids, and the loader writes them to mcp_tool_call. An MCP server's
    session.id goes stale after /clear, so the join is what attributes its spend correctly. Through
    the joined turn, external spend also gains a scope.
  • std.external.requests_unpriced keeps a partly priced run's observed cost as a lower bound
    instead of dropping it.
  • Query 7 version 3 reports partial runs apart from complete ones, and reports the join rate.
  • stdtel-conform --print-contract reports contract_version: 3. (#94)

Fixed

• <synthetic> is no longer counted as a model request. Claude Code uses that name for
  placeholder assistant messages, such as interrupted or failed responses, which carry zero usage.
  Counting them inflated llm_requests, and when one came first in a turn it became the span's model:
  one Prometheus series was already labelled gen_ai_request_model="<synthetic>". In 1,157 real
  turns, every turn that appeared to use more than one model was really one model plus <synthetic>.
• A span names a model only when its run used exactly one. This applies ADR-012 decision 5 to our
  own turns, sub-agents and skill tails. Genuinely multi-model runs were sub-agents, 5 of 200 sampled,
  and naming the first of two models said the run used one.
• scrub() dropped every list attribute without a word. It now passes a list of strings and
  nothing richer.
• stdtel-conform read an OTLP intValue as a string, and would have refused every correctly
  sent count.
• Collector: spanmetrics now counts across resources instead of per resource, so dashboards no
  longer read zero after a branch switch, a project change or an SDK upgrade. (#92)
• mise run load works again, having failed since #68, and the loader no longer reports keys that
  our own Langfuse overlay adds. (#93)