Lifts mort's pkg/logic/llms into executus/model, decoupled from mort:
- tiers.go: the tier resolver now reads a host-supplied config.Source under
"model.tier.<name>" with host-supplied fallbacks (Configure(cfg, defaults,
ttl)), instead of convar.Manager. Tier NAMES + specs are host config; the
resolution mechanism (cache, reasoning-suffix dialect, chain validation) is
generic. No tier names hard-coded in the harness.
- sink.go: usage/trace recording inverted off mort's llmusage/llmtrace into
UsageSink / TraceSink seams + a model-owned Span, with nil-safe context
attribution helpers (WithModel/WithTraceID/WithUsageTool/WithUsageUser).
Both sinks optional (nil = off) so a light host records nothing.
- lane decoration repointed to executus/lane; utils.Errorf -> fmt.Errorf.
- call.go keeps GenerateWith[T] (instrumented structured output) — this is the
structured-output primitive; no separate structured/ package.
- llmmeta moved over model/ (the meta-LLM helper: tier allowlist + JSON retry
+ ledger). Its tests configure a minimal tier table via TestMain.
New tests cover the inversion: config overrides fallback, tier registration,
reasoning-suffix survival, nested-tier rejection, nil-sink no-ops.
Full module: go build/vet/test -race green; core go.sum still free of
gorm/redis/discordgo/sqlite.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
