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v0.4.0

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@github-actions github-actions released this 16 May 10:15
· 68 commits to main since this release
v0.4.0
5e9a6bd 
Release v0.4.0

Observability subsystem + benchmarks + cleanup + aws_mapping removed.

Highlights:
- New tessera.observability: Prometheus histograms + OpenTelemetry (off by
  default, TESSERA_OTEL_ENABLED=1) + structured event hooks
- Hot-path correctness: JWKS pre-warm, regex pre-compile at policy load,
  cost-tier condition ordering (cheap-first within when[])
- OAuth: POST /revoke (RFC 7009) + /introspect signature verification +
  /register per-IP rate limiter (10/min default, configurable)
- Tooling: scripts/bump_version.py + tessera/_version.py
- Benchmarks: p50 decision latency 15-72us; blast-radius prefetch ~797x
  speedup vs OFF (100ms simulated IAM RTT)
- BREAKING: tessera.cost.aws_mapping removed (Q1 locked decision); migrate
  to cost_for_call() introduced in v0.3.0. InfracostQuery moved to
  tessera.cost.types; _BUILTIN_MAPPING -> BUILTIN_AWS_OPS in
  tessera.cost._aws_canonical_ops.

751 tests GREEN, mypy 0 errors, ruff 0 errors.
Assets 3
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