fix: Update error message and remove duplicate version field

[MarsonKotovi4]

Fixes two issues:

1. Package.json:

• Removes duplicate "version": "0.1.9-alpha.1" field
• Keeps single correct version definition

2. Src/index.ts:

• Improves TEE_MODE error message by adding article "A" for
  better grammatical correctness

Changes:

• agent/package.json: removed duplicate version field
• agent/src/index.ts: updated error message from
  "WALLET_SECRET_SALT required..." to
  "A WALLET_SECRET_SALT required..."

Risk: Low - changes only affect error message text and package metadata.

[github-actions]

Hi @MarsonKotovi4! Welcome to the elizaOS community. Thanks for submitting your first pull request; your efforts are helping us accelerate towards AGI. We'll review it shortly. You are now an elizaOS contributor!

[coderabbitai]

📝 Walkthrough

Walkthrough

A minor update to the agent package involves removing a redundant version declaration in package.json and a subtle grammatical adjustment to an error message in index.ts. The changes are cosmetic and do not impact the package's core functionality or behavior.

Changes

File	Change Summary
agent/package.json	Removed redundant version declaration, added trailing newline
agent/src/index.ts	Modified error message to add article "A" before WALLET_SECRET_SALT

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📜 Recent review details

Configuration used: CodeRabbit UI
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📥 Commits

Reviewing files that changed from the base of the PR and between fac4e81 and 69b93ec.

📒 Files selected for processing (2)

• agent/package.json (1 hunks)
• agent/src/index.ts (1 hunks)

✅ Files skipped from review due to trivial changes (2)

• agent/package.json
• agent/src/index.ts

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