Harden cost-algebra soft spots (overflow, warmth, T_core, admit) - #25
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Make barrier overflow fail-expensive, move warmth ρ_max into params, fold observed prefill wall into effective T_core, and document that cost ranks while admit/ledger sheds.
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Summary
Barrier overflow:
append_barriers_fail_expensivesaturates the last slot to (B_{\max}) instead of silently dropping penalties.Warmth ρ_max:
warmth.max_discountin params SoT; threat-model treats it as a first-class trust surface.T6 T_core: per-backend EWMA of prefill wall; routing uses
max(claimed, ewma).Cost vs admit: docs/rustdoc clarify Φ soft-cap — cost ranks, ledger/admit shed.
I have read CLA.md and certify my contribution under Apache-2.0 OR MIT
Test plan
cargo test -p demiurge-cost --libcargo test -p demiurge-cost --test positivitycargo test -p demiurge-router --test track_a