Remove duplicate JSDoc comments in Jwt.ts

[Copilot]

Addresses code review feedback from PR #20 identifying three identical JSDoc comment blocks for each method in libs/Jwt.ts.

Changes

• Removed duplicate JSDoc blocks from verifyOffline, decode, and verify methods
• Retained the most complete documentation variant for each method (includes @throws and @example tags)

Before

/**
 * Verifies a token using a public certificate. For security reasons the
 * `algorithms` option defaults to only allow `RS256` to avoid algorithm
 * confusion attacks. Callers may pass additional `VerifyOptions` when
 * needed. Resolves with a `Token` instance on success.
 */
/**
 * Verify token offline using a public certificate.
 * Defaults to `RS256` algorithm allowed list for safety.
 * @param accessToken - JWT string to be verified
 * @param cert - Public certificate or key used for verification
 * @param options - Optional jsonwebtoken VerifyOptions
 * @returns A Promise resolving to a `Token` instance if verification succeeds
 */
/**
 * Verify token offline using a public certificate.
 * Defaults to `RS256` algorithm allowed list for safety.
 *
 * @param accessToken - JWT string to be verified
 * @param cert - Public certificate or key used for verification
 * @param options - Optional jsonwebtoken VerifyOptions
 * @returns A Promise resolving to a `Token` instance if verification succeeds
 * @throws {Error} When verification fails (signature mismatch or invalid token)
 * @example
 * const token = await jwt.verifyOffline('ey...', pubKey)
 */
async verifyOffline(accessToken: string, cert: any, options?: VerifyOptions): Promise<Token>

After

/**
 * Verify token offline using a public certificate.
 * Defaults to `RS256` algorithm allowed list for safety.
 *
 * @param accessToken - JWT string to be verified
 * @param cert - Public certificate or key used for verification
 * @param options - Optional jsonwebtoken VerifyOptions
 * @returns A Promise resolving to a `Token` instance if verification succeeds
 * @throws {Error} When verification fails (signature mismatch or invalid token)
 * @example
 * const token = await jwt.verifyOffline('ey...', pubKey)
 */
async verifyOffline(accessToken: string, cert: any, options?: VerifyOptions): Promise<Token>

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