fix(agent-core-v2): preserve select_tools for disclosure

[lurenjia534]

Related Issue

Resolve #2381

Problem

In the experimental v2 engine, a profile allowlist can omit select_tools while deferred MCP tools are still announced. Contribution activation applied that allowlist to the gateway before the request-time disclosure policy could apply its existing carve-out. As a result, the top-level agent could be told that deferred tools exist but receive no select_tools schema with which to load them.

What changed

• Keep select_tools activatable when it is omitted from the profile allowlist, while continuing to honor an explicit profile disallowedTools entry.
• Preserve the existing request-time checks for model capability, the experimental flag, global policy, the session denylist, and provider visibility.
• Add unit coverage for both implicit gateway activation and the explicit-deny boundary.
• Add a provider-wire regression test that applies the profile allowlist before contribution activation, matching production lifecycle ordering.

Validation

• pnpm lint (passes with 0 errors)
• pnpm typecheck
• pnpm test (1,015 test files and 16,701 tests passed)
• pnpm --filter @moonshot-ai/agent-core-v2 lint:domain
• pnpm --filter @moonshot-ai/agent-core-v2 typecheck
• pnpm --filter @moonshot-ai/agent-core-v2 test
• pnpm --filter @moonshot-ai/agent-core-v2 build
• pnpm --filter @moonshot-ai/kimi-code typecheck
• pnpm --filter @moonshot-ai/kimi-code build
• Regression mutation check: restoring the old activation predicate makes the provider-wire regression fail with an empty tool schema; the fixed predicate passes.

No changeset is needed because this behavior is limited to the experimental v2 engine. No documentation update is needed because no command, configuration, or usage contract changed.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

⚠️ No Changeset found

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commit: bb3d4c8

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