Add Keenable backend to osaurus.search

[styskin]

Summary

• New keenable paid provider in osaurus.search, sitting at the top of paidProviderPriority.
• Posts to https://api.keenable.ai/v1/search with the user-configured KEENABLE_API_KEY in the X-API-Key header.
• Keenable is purpose-built web search for AI agents — see https://docs.keenable.ai.
• CHANGELOG bumped to 2.2.0.

Changes

• tools/search/Sources/OsaurusSearch/Plugin.swift
  • New keenableSearch(_:) backend mapping title / url / snippet-or-description / published_at-or-acquired_at into SearchHit.
  • mapKeenablePublishedAfter helper converting the d/w/m/y time_range arg into the ISO date Keenable expects under published_after.
  • Wired into runBackend, paidProviderPriority (first), providerHasSecrets.
  • Added optional KEENABLE_API_KEY to the manifest secrets list (same required: false as the other paid backends).
• tools/search/CHANGELOG.md — 2.2.0 entry.

Verification

• Endpoint contract verified live: POST /v1/search requires X-API-Key, returns {query, results: [{title, url, description, snippet, published_at?, acquired_at}]}.
• swift build clean. (Test target needs Xcode env for XCTest — not run from CLI.)

Test plan

• In a chat, configure KEENABLE_API_KEY in the Search plugin's secrets, then ask the agent to do a web search — confirm a keenable engine entry appears in the result attempts.
• Without the key, confirm keenable is silently skipped (no error to the user) and the cascade proceeds to other backends.

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