Thread a database handle through Init

[Calm0]

Init now takes a *sql.DB and passes it to the plugin entrypoint, so gameplay systems can reach the database directly instead of only through the runtime module. The plugin type assertion is updated to match.

[Copilot]

Copilot review overview

🟡 Changes recommended

Update the README usage examples for the new required Init argument.

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Review effort: Lite
Findings: 1

Open (1)

• Update README examples for new hiro.Init db argument · New

What changed in this PR

Updates Init to accept and forward a database handle to the plugin entrypoint.

Changes:

• Adds *sql.DB to the Init signature.
• Updates the plugin type assertion and invocation.
• Documents the API change in the changelog.

File	Summary
CHANGELOG.md	Documents the updated Init API.
base.go	Threads the database handle through Init.

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[Copilot]

Copilot review overview

🟡 Changes recommended

Existing binaries may fail at runtime, and the documented initialization example remains incompatible.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 1 · 1

Open (2)

• Preserve compatibility or clarify binary version migration failures · New
• Update README examples for new hiro.Init db argument