feat(hardening): Phase 15 — redaction, retry/backoff, budgets, threat-model docs

Release-readiness hardening.

- redaction.py (zero-dep): redact_secrets masks provider API keys, AWS/GitHub/Slack/
  Google tokens, bearer tokens, URL-embedded credentials, PEM private keys, and
  sensitive key=value assignments. Wired into the trace writer and the markdown report
  (on by default), so scan artifacts never leak a credential quoted from source.
- provider/openrouter.py: call_with_retry — exponential backoff on transient failures
  (HTTP 429/5xx, connection errors, timeouts); non-transient errors fail fast. Both the
  chat and embedding clients use it (max_attempts/retry_base_delay configurable).
- config [hardening]: redact_secrets (default true) + max_findings (bounded-CI output
  cap, 0 = unlimited; truncation is severity-ordered and disclosed as a `budget`
  degradation). Agentic spend stays bounded by [harnessx] max_cost_usd/token_threshold.
- docs/threat-model.md (trust boundaries, controls, sandbox limits) + docs/examples.md
  (six end-to-end walkthroughs); README "Security & hardening" section links both.
- CI lint/typecheck/test/detection-gate/dagger gates already existed.

tests/test_redaction.py, test_provider_retry.py, test_hardening_pipeline.py + config
tests. 206 passed, 4 skipped; ruff + mypy clean; detection gate PASS.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

tests/test_config.py

@@ -73,6 +73,22 @@ def test_load_config_reads_fusion_section(tmp_path: Path) -> None:
     assert config.fusion.high_assurance is True
 
 
+def test_hardening_defaults_when_section_absent() -> None:
+    config = load_config(None)
+    assert config.hardening.redact_secrets is True
+    assert config.hardening.max_findings == 0
+
+
+def test_load_config_reads_hardening_section(tmp_path: Path) -> None:
+    config_path = tmp_path / "openultrasast.toml"
+    config_path.write_text("[hardening]\nredact_secrets = false\nmax_findings = 5\n")
+
+    config = load_config(config_path)
+
+    assert config.hardening.redact_secrets is False
+    assert config.hardening.max_findings == 5
+
+
 def test_write_resolved_config_creates_json(tmp_path: Path) -> None:
     output = tmp_path / "run" / "resolved_config.json"