Update Hronaut release and trial metadata

[Hronom]

What kind of change?

• New agent listing
• Correction to an existing entry
• Removal
• Code / site change

I maintain Hronaut. This follows the existing listing integrated in #103; it is not a duplicate submission or a request for a verification badge.

Changes

• Update Hronaut's version from 2.4.1 to the current public v2.4.29 release.
• Keep the description within 200 characters while clarifying source availability and the current 10-day trial, then USD $4/month or $24/year per named user. These terms come directly from the versioned Subscription and Trial License.
• Update the record timestamp and add the required updated changelog entry.
• Preserve the existing setup URL, skills, categories, authentication/access fields, featured: false and verified: false. The MCP endpoint remains local/loopback; no remotely verified endpoint or external integration is claimed.

Separate structured-data observation

The live Hronaut page currently emits operatingSystem: "Cloud" and a USD zero-price offer, despite the desktop/trial terms. The shared template at the current base commit hardcodes the OS and derives free pricing from authType === 'none'.

This data-only PR does not fix those shared template defaults. Could deployment/OS and pricing be modeled separately, or omitted when unknown? Authentication does not establish price. Hronaut documents optional bearer authentication, so changing its auth field merely to suppress a free offer would be misleading. I have left that shared-site decision to the maintainer rather than changing other listings as part of this correction.

Checklist

• npx --no-install tsx scripts/validate-content.ts passes locally: 540 agents, 21 categories, 0 violations
• Added a line to content/changelog.json
• Existing setup, provider and icon URLs return HTTP 200
• Skills retain their existing documented scope; no new capability claims
• verified: false and featured: false preserved
• git diff --check passes

Validation here covers catalog data and the changed record, not a new Hronaut runtime or site-build test. No paid placement, endorsement, traffic or adoption claim.

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