feat(phoenix): add AgentV eval adapter

[christso]

Summary

• Adds @agentv/phoenix-adapter as a repo-local package for converting AgentV-authored eval suites into Phoenix dataset/experiment payloads.
• Reuses @agentv/core's eval loader so AgentV YAML remains the source of truth for case expansion, external datasets, Agent Skills evals.json, assertion parsing, interpolation, and metadata handling.
• Ports deterministic Phoenix CODE evaluator support for contains, regex, equals, and is-json; reports LLM/code/trace/composite/metric/custom evaluator families as unsupported instead of silently adapting them.
• Adds root scripts and CI smoke coverage via bun run phoenix:assert-smoke.

Verification

• bun --filter @agentv/phoenix-adapter test — 18 tests passed.
• bun --filter @agentv/phoenix-adapter typecheck — passed.
• bun run phoenix:assert-smoke — dry-run smoke passed: 1 suite, 4 tests, baseline count 4, 0 failed suites.
• bun run test — passed (core/eval/phoenix-adapter/cli tests).
• Pre-push hook on git push passed: build, typecheck, lint, test, validate eval YAML files.

Smoke / before-after evidence

Before this branch, AgentV had no in-repo Phoenix adapter package or phoenix:assert-smoke script. On this branch:

bun run phoenix:assert-smoke
Suites: 1
Tests: 4
Passed suites: 1
Failed suites: 0
| passed | `examples/features/assert/evals/dataset.eval.yaml` | 4 | 4 | |

Full dry-run is intentionally not used as a CI gate yet. Current informational full dry-run result is 97 suites / 405 tests / 93 passed suites / 4 failed suites. The failures are documented in packages/phoenix-adapter/docs/e2e-verification.md and are source/baseline or source-reference parity issues, not Phoenix conversion crashes.

Follow-up work

• Implement AgentV-compatible Phoenix adapters for llm-grader and code-grader semantics.
• Decide whether to expand deterministic support to AgentV's extended string-match families (icontains-*, contains-any, starts-with, etc.).
• Resolve the known full dry-run source/baseline drift before making full dry-run parity a blocking CI check.

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