v1.0.0

Added

• .teststop/config.yaml support. The optional per-project config file is
  now real. Every key maps one-to-one onto an existing teststop run flag.
  Settings resolve with precedence config file < TESTSTOP_RUN_* env var <
  explicit CLI flag. A missing file is not an error; malformed YAML or an
  unknown key fails loudly. See .teststop/config.example.yaml for the keys.

• --ai-concurrency flag (default 1). Caps the number of concurrently
  running AI-mode scenario executions to prevent rate-limit exhaustion. Config
  key ai_concurrency; env TESTSTOP_RUN_AI_CONCURRENCY.

• Structured AI error detection. The Claude adapter now calls
  claude --output-format json and parses the outer envelope, surfacing
  structured errors (rate-limit, auth failure, refusal) with context instead
  of raw stderr. Non-zero exits and envelope is_error: true both map to
  informative error messages.

• E2E pipeline test (test/e2e/). A full reader → mandate → adapter →
  memory → reporter → exit-code integration test using a fake-claude fixture
  script. Runs without real tokens; skippable via -short.

• v1.0 contracts frozen (CONTRACTS.md). Exit codes, scenario JSON schema,
  run output envelope, memory file format, and environment variables are
  declared stable. Breaking changes require a major version bump.

• examples/waymark-demo/. Replayable demo artifact: 52-scenario run
  against the waymark MCP middleware repo, with the captured JSON report,
  Markdown summary, the mandate used, and replay instructions.

Changed

• pkg/scenario/types.go package comment declares the schema FROZEN at v1.0.
• internal/cli test coverage raised from 28.9% → 51.6%.

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