fix(config): sync MetaConfigSchema version default with package.json

[konard]

Summary

Fixes #273.

MetaConfigSchema.version previously defaulted to the hardcoded string "1.0.0", which disagreed with the actual package version (0.8.10). Any config file without an explicit meta.version field would carry this misleading version string in logs and migrations.

Changes

• src/config/schema.ts: Import pkg.version from package.json (JSON import — resolveJsonModule was already enabled) and use it as the Zod default, so the schema version stays in sync with package.json automatically on every release.
• src/config/__tests__/loader.test.ts: Add acceptance-criteria unit test asserting that loadConfig on a minimal config (no meta block) returns meta.version === pkg.version.

How to reproduce the issue

Before the fix:

import { MetaConfigSchema } from "./src/config/schema.js";
console.log(MetaConfigSchema.parse({}).version); // "1.0.0"  ← wrong

After the fix:

console.log(MetaConfigSchema.parse({}).version); // "0.8.10" ← matches package.json

Test plan

• New unit test should default meta.version to the package.json version in loader.test.ts — fails before fix, passes after.
• All 52 existing tests in src/config/__tests__/loader.test.ts continue to pass.
• tsc --noEmit passes with no new errors.
• ESLint passes on changed files.

[konard]

Solution summary

Done. Here's a summary of what was done:

Root cause: MetaConfigSchema.version in src/config/schema.ts:189 had a hardcoded default of "1.0.0" while package.json declared version "0.8.10". Any config file omitting a meta.version field would silently receive the wrong version string.

Fix (2 files changed):

1. src/config/schema.ts — Added import pkg from "../../package.json" with { type: "json" } and changed the default to z.string().default(pkg.version). resolveJsonModule was already enabled in tsconfig.json.

2. src/config/__tests__/loader.test.ts — Added the acceptance-criteria unit test: should default meta.version to the package.json version (verifies loadConfig on a minimal config returns meta.version === pkg.version). All 52 tests pass.

PR: #275

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[konard]

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